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Trilliax, once proud servant to the nightborne aristocracy, has been discarded and left to slowly deteriorate among other surplus constructs. While an unwavering will to carry out its tasks remains, the passage of time has splintered this construct's personality matrix. It now unpredictably switches from one mode to the next, ranging from doting caretaker to homicidal sterilizer, craving recognition and validation from a master that no longer exists.
So whats different on Mythic difficulty? not too much to be honest.
On Mythic difficulty, Trilliax will occasionally undergo a Personality Transference, activating one of the broken constructs in the alcoves around the edge of the encounter area. The activated construct becomes Trilliax's Imprint and gains one of Trilliax's personalities.
Read the full guide at: http://www.wowhead.com/trilliax-nigh...strategy-guide