(Aug 29: Since TFT Patch 9.17, the Burn Effect (Grievous Wounds) doesn’t fully prevent healing, instead it reduces it by 80%.
Aug 14: This article has been updated to reflect Morello’s Burn duration increased to 10s in TFT Patch 9.16.
July 31: Patch 9.15B Update: Morello’s Burn damage has been reduced from 25% to 20%. You can read full TFT Patch 9.15B notes here.)
Morellonomicon is still considered a top tier item in TFT because of its versatility. It works great on multiple champions, both in early-game and late-game as well.
Does Morello Stack in Teamfight Tactics?
The short answer is NO, it doesn’t stack.