No Ultimate Spellbook-specific changes; identical to the Summoner's Rift version.
Unique Active · Oathsworn Bond
Consumes this item to initiate a 3.5-second cast time and a 3-second channel afterwards from the user and the target allied champion, both becoming bound allies. The target is unable to act for 6 seconds after the channel's duration. Afterwards, the target becomes an Oathsworn.
11.7
9.19
4.20
Summoner's Rift · URF · One for All · Swiftplay · Ultimate Spellbook · ARAM · Nexus Blitz · Arena