Vorph
Silver Baronet of the Realm
Perdition is even worse imo. I had a rift go from an easy 7 minute clear to around 12 minutes because every single time he teleported it one-shot me. Through 226M toughness (and no, I wasn't letting him backstab me). You can't even really avoid the teleport either, he can use it from a screen and a half away and still hit you.