Kog'Maw's R change.
This severely hinders AP Kog'Maw, who's a champ I really enjoy playing. Just like how AP Trist lost any kind of power she had pre-6, Kog is now losing a ton of power post-6.
I really hope in the next patch there will be a higher AP ratio on his R to compensate for the reduced damage.
AP Kog players unite!