Sylas no longer permanently gains health and increases in model size from successful kills with a stolen R - Feast from an enemy Cho'Gath
I know it started doing this a couple patches ago (unless he currently was holding a Cho R) but sad to see it officially go :((
Edit: /u/RiotSquad5 confirmed it's actually returning to permanently grant stacks rather than only gaining the bonuses while "holding" Cho R.
Patch note is wrong. Fixed it so this interaction works again, not made it so it doesn't.