Area of Effect Slow (instant) increased to 40% from 15%
Damage over time or Multi-hit Slow increased to 20% for 1 second from 15% for 1.5 seconds
Summoned minions (e.g. Children of the Grave, Summon Tibbers) now slow on-hit 20% for 1 second
4.13
Ability power increased to 100 from 80.
Health reduced to 400 from 500.
V1.0.0.63
Slow duration increased to 2 seconds from 1.5 seconds.
It will now trigger on dealing non-periodic spell damage, instead of spell hit. This means that spells like Destiny or Time Warp, which previously triggered the effect, won't anymore; however, Rupture will now slow on dealing damage instead of on the initial cast, Powerball will now trigger the effect when you hit units, etc.
V1.0.0.152
Item cost reduced to 2900 from 3105.
Combine cost reduced to 605 from 700.
V1.0.0.106
Slow duration reduced to 1.5 from 2.
Updated the tooltip to reflect slow information for single target and damage-over-time slows.
V0.9.25.34
Slows from items will no longer stack. (i.e. Frozen Mallet, Rylai's Crystal Scepter) The largest slow will take effect until duration wears then next largest slow will take effect if it's still active.
V0.9.25.24
Single target slow reduced from 40% to 35%.
V0.9.25.21
Health and ability power.
Now causes single target spells to slow by 40% for 1.5 seconds (15% for multi target spells).
Passive: After a spell cast, your champion's next basic attack reduces your target's movement speed by 35% for 2.5 seconds. This effect can only occur once every 6 seconds.
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+450 g = 2,600 g