Rare Abyss monster with Soul Siphoner mod make me committing suicide in game

I have 2680 hp 35k armour and die in 2s against a rare abyss monster. He just teleport on me and i die... the message in chat said "CaulShiverBeast has committed suicide". I've already faced a monster with this mod, but never with such difficulty. It s impossible to survive to this, so is it a bug or just not balanced at all?
thank you for your response