We’ve datamined all the different Death Knight Tier set appearances for Dragonflight Season 1. The Mythic and PvP Elite sets have special animations and effects!
Death Knight Tier Set Transmogs from Vault of the Incarnate Raid
Death Knight Tier Set Transmog from Mythic Mode
The Mythic Death Knight tier set transmog has special lightning and flame effects attached to the Helm and Shoulder pieces! You can see these effects in the video below.