No Ultimate Spellbook-specific changes; plays as on Summoner's Rift.
Abilities
PassiveProphet of an Elder God
Illaoi and the Vessels she creates spawn Tentacles on nearby impassible terrain. Tentacles swing at spirits, Vessels, and victims of Illaoi's Harsh lesson. Tentacles deal physical damage to enemies hit, and will heal Illaoi if they damage a champion.
QTentacle Smash10/9/8/7/6s40/45/50/55/60
Increases the damage dealt by Tentacles. When activated, Illaoi smashes down a Tentacle that deals physical damage.
WHarsh Lesson4s30
Illaoi leaps to her target, dealing physical damage and causing nearby Tentacles to also swing at the target.
ETest of Spirit16/15/14/13/12s
35/40/45/50/55
Illaoi rips the spirit from a foe's body, forcing it to stand before her. Spirits echo a percentage of the damage they take to the original target. If killed, or if the target gets too far from the spirit, the target will become a Vessel and begin spawning Tentacles.
RLeap of Faith120/95/70s100
Illaoi smashes her idol into the ground, dealing physical damage to nearby enemies. A Tentacle spawns for each enemy champion hit.
Patch history
26.10 · May 13, 2026
Harsh Lesson
Undocumented: Illaoi now jumps higher and slower during the leap animation. (before - [https://www.youtube.com/watch?v=B4TNumlko-c], after - [https://youtu.be/hGjkCZS_EWA])
Undocumented: While the ability is active, Tentacles are no longer commanded to attack on-hit without consuming the empowered attack (interacting with effects such as Guinsoo's Rageblade; Dusk and Dawn; Statikk Shiv). (before - [https://www.youtube.com/watch?v=PnBIVSfg9w8])
Undocumented / Bug: The melee attack now triggers Tentacle slams when hitting a structure, while the dash attack does not. [https://youtu.be/b0Jjxxy5hxg]
Undocumented / Bug: When using the melee version of the attack, spell shields no longer pop to prevent Tentacle commands. (before - [https://www.youtube.com/watch?v=MmVGVrsNWv0], after - [https://youtu.be/V4GJQj9insc])
Note: When using the dashed version of the attack, spell shields still pop to prevent Tentacle commands.
Undocumented / Bug: The melee version of the ability no longer causes Tentacles to attack if Illaoi has an active spell shield. [https://www.youtube.com/watch?v=sATyJjiwt9M]
Undocumented / Bug: When the melee attack kills the target, Tentacle slams are now offset from the target, while they are not from a dash attack. (before - [https://youtu.be/tdey_QEHkVo?t=1958], after - [https://youtu.be/9qptAfCSfkM?&t=63], dash - [https://youtu.be/9qptAfCSfkM?t=171])
26.4 · Feb 19, 2026
Prophet of an Elder God
Tentacle base damage increased to 9 + (180-9)/17*(x-1) from 9 + (162-9)/17*(x-1).
25.18 · Sep 10, 2025
Prophet of an Elder God
New Effect: Tentacles will no longer spawn during the channel or dash of Teleport / Unleashed Teleport.
Tentacle spawning is now deferred until their cast ends.
Harsh Lesson
AD ratio reduced to 3.5% per 100 AD from 4%.
Test of Spirit
Vessel debuff duration increased to 4 seconds from 3.
Undocumented: The Vessel no longer has a 5 to 3 second lockout for spawning successive Prophet of an Elder God.
The only condition for a new Tentacle to spawn is now range between them.
Undocumented:
25.16 · Aug 13, 2025
Prophet of an Elder God
Tentacle AD ratio increased to 110% AD from 105% AD.
Spawn cooldown reduced to 18 to 7 seconds from 20 to 7.25.
25.15 · Jul 30, 2025
General
All tooltip locations where values related to Prophet of an Elder God are noted will now properly update with changes to their actual values.
Prophet of an Elder God
Tentacle AD ratio increased to 105% AD from 100% AD.
Tentacle Smash
Bug Fix: Corrected AD ratio in the tooltip.
Test of Spirit
Vessel debuff duration reduced to 3 seconds from 10.
Automatic Tentacle slam cooldown against Spirits and Vessels reduced to 4.5 to 3.5 from 5.5 to 3.5.
35 older patches
25.9 · Apr 30, 2025
Prophet of an Elder God
Bug Fix: Tentacle slams no longer incorrectly deal damage to enemies in Illaoi's realm when the tentacles are in a different realm. (e.g. Realm of Death). (before - [https://youtu.be/s0oH8D4M5IA?t=592] [https://www.youtube.com/live/vl5SW_XDo2o?t=1763s])
Bug: Tentacle slams still visually appear in Illaoi's realm, but they are now prevented from dealing damage in all realms, including the realm the tentacles are in. [https://youtu.be/7IroB7Gwo5Y&t=12m59s] [https://youtu.be/nXg-OutbtTs]
14.22
Stats
Base attack damage reduced to 65 from 68.
Mana growth reduced to 50 from 60.
14.4
Prophet of an Elder God
Tentacle AD ratio reduced to
Base stats
Health656 +115/lvl
Mana350 +50/lvl
Attack Damage65 +5/lvl
Attack Speed0.625 +2.5/lvl
Armor35 +5/lvl
Magic Resist32 +2.05/lvl
Base Health Regen9.5 +0.8/lvl
Base Mana Regen7.5 +0.75/lvl
Move Speed350
Range125
Melee · Resource: Mana
V25.15 undocumented change reverted. Tentacles can now go idle even if there is a
Spirit
in range, no longer allowing them to continue attacking targets.
Removed: 1.1 seconds lockout before the Vessel can start spawning the first Tentacle.
Undocumented: Tentacles now stay awake if there is a Spirit in range, even if Illaoi or a Vessel is not around, allowing them to continue attacking targets. (before - [https://youtu.be/o91SnonQ3TI] [https://youtu.be/ba7ZW9fUtZ8], after - [https://youtu.be/2z55JLZP6MQ] [https://youtu.be/_-AABStf2ag] [https://youtu.be/iH4SrivCId8])
100% AD
from
115% AD
.
Test of Spirit
Tether now innately checks every 0.05 seconds for valid range conditions, and no longer waits for every 8th server tick.
Bug Fix: Tentacle attack call range has been increased to match Harsh Lesson, to 950 from 900.
14.3
Prophet of an Elder God
Tentacle range increased to 925 from 800.
Tentacle base damage reduced to 9 to 162 from 10 to 180.
AD ratio reduced to 115% AD from 120% AD.
Tentacle Smash
Undocumented: Allied Original Illaoi skin Tentacle Smash indicator has been moved forward by 50 units (hitbox unchanged). Other skins unchanged. [https://youtu.be/4BCa6CrDOzA]
Harsh Lesson
Undocumented: Tentacle call range increased to 950 from 800.
Undocumented: The dash version of the ability now properly causes the basic attack to critically strike with Sundered Sky.
Test of Spirit
Undocumented: Tentacle call range increased to 900 from 800.
14.2
Stats
Health growth increased to 115 from 109.
Base mana increased to 350 from 300.
Mana growth increased to 60 from 50.
Prophet of an Elder God
Heal per tentacle hit increased to 5% missing health from 4.5%.
13.20
Test of Spirit
Bug Fix: Spirits of champions without a resource now have the proper duration.
Test of Spirit
Bug Fix: The spirit out of an enemy Briar no longer instantly reaches the end of its life duration if the clone was created while she was not under the effect of her Blood Frenzy.
Now bugged in this same way with resourceless champions such as Riven and Garen instead.
Undocumented - Estimated: Grabbing the spirit of champions with special resource bars (i.e Flow, Ferocity) no longer makes the spirit not show its lifetime.
13.6
Test of Spirit
Undocumented: Killing the Spirit no longer awards 44 Experience, unlike other clones. (before - [https://www.youtube.com/watch?v=oV7pBhM88Eg])
Note: It still awards 25 g.
12.15
Test of Spirit
Undocumented: Spirits now properly cause turrets to Warm Up their attacks. (before - [https://youtu.be/QnJQSZsk6Co])
12.10
Stats
Base health increased to 656 from 586.
Health growth increased to 109 from 95.
Armor growth increased to 5 from 3.8.
Magic resistance growth increased to 2.05 from 1.25.
Prophet of an Elder God
Heal per tentacle hit reduced to 4.5% missing health from 5%.
12.8
Tentacle Smash
Bug Fix: Buffering the ability no longer causes the caster to instantly face in the direction of the cursor.
Harsh Lesson
Bug Fix: The dashed version of the ability now correctly causes Tentacles to attack if Illaoi had an active spell shield.
Test of Spirit
New Effect: Now grants assist credit if the target is killed even when the Spirit does not take any damage.
Bug Fix:Spirits spawned are no longer invisible if the tethered champion was camouflaged and being revealed by a Control Ward.
Bug Fix: Buffering the ability no longer causes the caster to instantly face in the direction of the cursor.
Bug Fix:Spirits that expire are no longer automatically killed by being dealt 100% of their health by the Vessel, triggering their takedown effects and E healing.
12.6
Harsh Lesson
Bug Fix: Fixed a bug where the dashed version of the ability would not deal bonus damage based on the target's maximum health.
Undocumented - Estimated: Bonus damage is now dealt after the basic attack, affecting interactions like Blade of the Ruined King.
General
Undocumented: All abilities now buffer within 0.5 seconds of being cast while on cooldown or sealed.
Prophet of an Elder God
Removed:Tentacles spawning near base gates on Summoner's Rift for both team's bases.
Bug Fix: Inactive Tentacles no longer try to attack when commanded by Harsh Lesson, causing their attacks upon becoming active to be delayed. (before - [https://youtu.be/BUcTjjNQGik] [https://youtu.be/3z8xC6-_xdQ])
Undocumented: Instead the attack is now queued if the Tentacle becomes active in the next 0.5 seconds. [https://youtu.be/yLYMr3IZziU]
Not Functional: This bug fix is not functional if Harsh Lesson is used an instant before the Tentacle spawns. [https://youtu.be/bnc3eYACDBk]
Undocumented - Estimated:Tentacles are no longer recognised as wards, no longer revealing nearby Control Wards.
Tentacle Smash
Bug Fix: Ability is now visible to enemy champions when cast outside of their vision.
Note:Illaoi now reveals herself. [https://youtu.be/JRizCjxyc5g]
Undocumented: Buffering the ability now causes the caster to instantly face in the direction of the cursor, with gameplay implications.
Harsh Lesson
New Effect: Other abilities can now be buffered during the dashed version of the attack's windup.
Not Functional: The same happens for the melee version.
Bug Fix: Visual indicator now properly displays the correct range of the empowered attack.
Undocumented: Active effects (such as Flash) are no longer locked out from being cast during the dashed version of the ability (now works the same as the melee version). [https://youtu.be/d0MDFoWYI-U]
Undocumented: The dashed version of the ability now deals damage and causes Tentacles to attack if it was blocked or dodged. [https://youtu.be/r02dsIN6uBs] [https://youtu.be/rTgSMOuszLU] [https://youtu.be/AbeVcwWZdDs]
Undocumented / Bug: The dashed version of the ability no longer causes Tentacles to attack if Illaoi has an active spell shield.
Test of Spirit
Bug Fix:Spirits that expire are no longer automatically killed by being dealt 100% of their health by the last assisting ally, granting them creep score.
Undocumented: It now is so by the enemy Vessel instead, triggering their takedown effects and E healing but without granting them the creep score.
Bug Fix: The ability is now visible to enemy champions when cast outside of their vision.
Note:Illaoi now reveals herself. (before - [https://youtu.be/K6-E5JiXpIw], after - [https://youtu.be/Fq2KuW55oVs])
Undocumented: Buffering the ability now causes the caster to instantly face in the direction of the cursor, with gameplay implications.
Undocumented: Other spells can now be buffered during the entire portion of the ability's cast time, instead of only while pulling the Spirit.
Undocumented: Inactive Tentacles are no longer automatically commanded to attack the Spirit or Vessel, causing their attacks to go on cooldown without actually attacking.
Leap of Faith
New Effect: Other spells can now be buffered during the ability's cast time.
Removed:Illaoi automatically turns to face the closest enemy champion on cast, affecting Tentacles spawned positions. (before - [https://youtu.be/R8VjK2FzfiY])
Illaoi now only turns to face towards the cursor position.
12.4
Stats
Base attack speed increased to 0.625 from 0.571.
Attack speed ratio increased to 0.625 from 0.571.
Harsh Lesson
AD ratio increased to 4% per 100 AD from 2% per 100 AD.
Test of Spirit
New Effect: After hitting the ability, Prophet of an Elder God are now lenient towards becoming dormant for 1.5 seconds, allowing them slightly more time to attack their targets if the caster dies while pulling the Spirit.
11.22
Test of Spirit
Bug Fix:Death's Dance no longer considers the Spirit as a champion for the takedown effect.
11.21
Harsh Lesson
New Effect: Base damage now triggers spell effects.
Probable Bug: Since bonus damage already triggered spell effects, now certain effects are triggered twice (i.e Arcane Comet cooldown reduction).
11.15
Tentacle Smash
Bug Fix:Illaoi's model animation no longer fizzles if she inputs another command right after casting the ability.
11.14
Stats
Base movement speed increased to 350 from 340.
11.12
Stats
Mana growth increased to 50 from 40.
11.4
Test of Spirit
Undocumented:Duskblade of Draktharr no longer considers the Spirit as a champion for the takedown effect.
11.1
Stats
Base magic resistance reduced to 32 from 32.1.
Base health increased to 586 from 585.6.
10.23
Test of Spirit
Undocumented: The lifetime of a RumbleSpirit is no longer shorter than normal. (before - [https://youtu.be/r8c9WMoGNAA] [https://youtu.be/NPzADZ30U5k])
Undocumented: The Spirit of an Ekko no longer triggers W.
10.21
Harsh Lesson
Undocumented:Spell shields now pop to prevent Tentacle commands, but they do not prevent Harsh Lesson's additional damage. [https://youtu.be/Ihvb-qB3xyU?t=12]
10.20
Prophet of an Elder God
Cooldown reduced to 20 to 7.25 seconds from 20 to 12.
Harsh Lesson
Bug Fix:Harsh Lesson no longer pops spell shields and now always deals full damage to the targeted enemy, instead of only doing full damage if the dashed version was used.
Test of Spirit
Bug Fix:Lulu team can no longer get permanent vision of an area if she is cloned by Test of Spirit and dies while Help, Pix! is activated on Lulu.
10.13
Tentacle Smash
Bug Fix: Casting the ability with the cursor position pointed exactly at Illaoi's location, no longer desyncs the hitbox indicator from the actual area of damage. (before - [https://www.youtube.com/watch?v=C1PkOpb1534])
Leap of Faith
Bug Fix: Tentacles no longer sometimes spawn in the same position and hit enemies on a very large area or globally. (before - [https://youtu.be/no5y6Y92W-I] [https://youtu.be/3-tDLLxTQMA])
10.9
Test of Spirit
Undocumented:Perfect Timing no longer considers the Spirit as a champion for the takedown effect.
10.8
Harsh Lesson
Indicator added to show recast ability timer.
10.6
Test of Spirit
Undocumented:Blade of the Ruined King no longer has its damage capped against the Spirit as if it was considered a minion. (before - [https://youtu.be/njYash_tWRs])
Undocumented: I, Voracity, Highlander and Evolved Wings takedown effects no longer trigger on the Spirit.
Undocumented:Perfect Timing now considers the Spirit as a champion for the takedown effect.
10.3
Test of Spirit
Bug Fix: If Sett has no points in Haymaker, Test of Spirit will now properly extrude his vessel.
10.1
Test of Spirit
Bug Fix: Can no longer pull spirits of targets protected by Black Shield.
9.19
Harsh Lesson
Bug Fix: Can now be cast while grounded or rooted.
Undocumented: If Illaoi attack commands and then casts the ability while rooted, she will no longer perform the dash, but instead will use the close range version within its dash range. (before - [https://youtu.be/oaIrf8z3t4U], after - [https://youtu.be/c_ZnWcuaeB0])
9.18
Harsh Lesson
Bug Fix: Can no longer dash while rooted.
Undocumented: Can no longer be cast while grounded or rooted. If casted before, only the close version may be used, while negating the attack commands while being in dash version. (before - [https://www.youtube.com/watch?v=M7RUUZG-Hek], after - [https://youtu.be/oaIrf8z3t4U])
9.15
Test of Spirit
Undocumented: Get Excited! takedown effect no longer triggers on the Spirit.
9.13
Prophet of an Elder God
Removed: Tentacles going into an idle state when Illaoi or a Vessel are not around, being placed on 1 health and visibly becoming small.
Not functional: Tentacles still go into a type of idle state which cancels any following queued attacks and which prevents starting new attacks against valid targets. (before - [https://youtu.be/44elnbtKjCA] [https://youtu.be/BS8eF1n30Co] [https://youtu.be/CLiU8Mt_qfw] [https://youtu.be/J4JReHYdsaQ] [https://youtu.be/wbSmPzriU5g] [https://youtu.be/GjEID7nCRvg] [https://www.youtube.com/watch?v=u2pI-kMoMKY], after - [https://youtu.be/4a3YwqgSzKQ] [https://youtu.be/Vm52XxtMdoU] [https://youtu.be/hbdiEhDuyds])
New Effect: Tentacle damage now also scales with 40% AP.
New Effect: Cooldown is now pingable.
Tentacle lifetime while dormant reduced to 30 seconds from 60.
Range of enemies to gain vision of tentacles reduced to 1000 units from 1400.
Bug Fix: Enemy champions no longer globally gain vision of tentacles that are slamming.
Undocumented:Illaoi can no longer spawn Tentacles on ally invulnerable structures (the Vessel still can). [https://youtu.be/D8r_7zpD3tY] [https://youtu.be/xJ4Jwm7jhZ8] [https://youtu.be/1-eXV50_mgQ]
Undocumented: When the inhibitor is down, Nexus turrets now only have a single hardcoded valid space on each of their external sides to spawn Tentacles on. [https://www.youtube.com/watch?v=xJ4Jwm7jhZ8]
Undocumented: Commanded Tentacles now attack in the order they were commanded to. For example, doing an E-W will first do the E attack and then the W attack rather than two W attacks. This fixes effects based on cast instance. (before - [https://youtu.be/Os95B9Y_AjU] [https://youtu.be/v2FNwkrcVuo] [https://youtu.be/j9TfawNGURQ] [https://youtu.be/v6-BySy7ifU])
Undocumented: If a Tentacle is killed while attacking, the Tentacle will first finish its attack and then die.
Harsh Lesson
New Effect: Now has a minimum base damage of 20 to 60, that can be applied on turrets.
Test of Spirit
Removed: Spirit duration being reduced by 1.25 seconds each time the target damages Illaoi with basic attacks, by 1 second with single target spells and by 0.66 seconds with area of effect ones.
Spirit duration reduced to 7 seconds from 10.
Vessel duration reduced to 10 seconds from 12.
Tentacle automatic attack cooldown reduced to 5.5 to 3.5 seconds from 10 seconds at all levels.
Undocumented: Grabbing the spirit of a champion with red resource (i.e rage) no longer makes the spirit not show its lifetime. (before - [https://youtu.be/N91Qshu-XgU])
Undocumented: Tether now breaks if the target moves to Realm of Death.
Undocumented: Ravenous Flock takedown effect now also triggers when the Spirit dies, regardless of being allied or enemy.
Leap of Faith
Maximum tentacle summons increased to 6 from 5.
New Effect:Leap of Faith spawned Tentacles now linger for an extra 0.25 seconds after losing the buff, during which they can continue receiving attack commands. [https://youtu.be/iirLAJQKfrY]
Undocumented: If Illaoi dies within 0.25 seconds of using the ability, already spawned tentacles will not be empowered. [https://youtu.be/rq3eihP2wdE]
9.11
Leap of Faith
Undocumented: Hitting the Spirit no longer spawns two tentacles. (before - [https://youtu.be/6HpPVKyku-k])
9.9
Prophet of an Elder God
Undocumented:Spell shields now always block Tentacle slams, instead of only blocking them if they were triggered by a melee Harsh Lesson, or if the Tentacle was awakened by a Vessel and commanded by Test of Spirit.
Before this, spell shields would pop but would not block the damage of Tentacle slams commanded by a dashed Harsh Lesson, or if the tentacle was awakened by Illaoi and commanded by Test of Spirit. In addition, Prophet of an Elder God's damage reduction would not consider the Tentacle that popped the spell shield, causing the reduction to start from the third Tentacle hit, instead of from the second. (before - [https://youtu.be/arIxnuq71vI])
Harsh Lesson
Undocumented: Can no longer issue an attack command after casting the ability to dash while rooted. Can still dash if the attack command is issued before casting the ability. [https://www.youtube.com/watch?v=M7RUUZG-Hek]
Test of Spirit
Undocumented: Can now grab the Spirit of clones.
Undocumented: League of Draven no longer triggers when killing the Spirit.
Undocumented: Voracity, Highlander and Evolved Wings takedown effects now trigger on the Spirit.
Undocumented: No longer blocks Kayle from using her Celestial Blessing while the Spirit is nearby.
Undocumented: The Spirit can no longer be targeted by Divine Judgement.
Leap of Faith
Undocumented: Extra tentacles now spawn for every clone hit.
Note: Since the Spirit is both a clone and was special cased to spawn a tentacle, it now spawns two tentacles instead of one. [https://youtu.be/6HpPVKyku-k]
9.8
Test of Spirit
Undocumented: League of Draven and I now trigger on the Spirit.