@ActRaiserTheReturned Yeeeaah, that's not something that has been created in-game yet, so I'd prefer that level 12 heroes not have omniscience or nigh omniscience. Not even gods know exactly what's going on anywhere. No one knows Thulemiz is a Lich Lord other than his followers, and those have not spoken to anyone. His aura is completely different and no one should be able to realise it is him. He is simply 'The Lich', 'The Lich Lord', 'The Great Lich Lord', 'The Necromancer'.
Also, as the Silent Six will be completely invisible during the encounter, and too far away for anyone to detect, no one will be able to put the pieces together.