I’m glad the developers improved many Sets in Balance Patch 2.4; however, I think they should fix the bug with Trang-Oul’s Avatar.
If you complete Trang-Oul’s Avatar set, the Necromancer will transform into a Vampire in appearance and will get skills such as Meteor, Fire Wall, and Fire Ball.
However, according to The Arreat Summit, there is a bug that has not been fixed that increases the casting delay resulting in slower casting (even with fast cast items).