The buff in Patch 8.2 had two functions. Firstly, it turned his Blood Boil into a mini Rabadon's Deathcap by boosting the target ally's AP by 40 percent as well as their attack speed. This made champions like Azir, Diana, and yes, even Kog'Maw, wildly OP with Nunu, who is now essentially a Blood Boil bot.
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