“Last night, something powerful waylaid me from the shadows. It struck me with a sufficiently great Art to shatter my mind and destroy the better part of my life's memories.
Because of the higher powers that sponsor me, the attack was not fatal, though it certainly would have been for any mortal man. I have fewer resources now than I would like, and I will take days to fully recover them. Some of the knowledge of the enemy has been lost. What I have retained is that the thing is highly mobile, that it does not hesitate to kill, that it fears no law nor maze nor locked door in Sigil, and that it has the capacity to place a mark on a victim such that it can find them wherever they flee, anywhere across the planes.”
He pauses. “It's possible that acting as you have, you have already been so marked. I do not begrudge you moving my body, but speaking to you now bluntly, I tell you that the length of your own lifespan may well depend on you communicating to me precisely where you went, what you did, what you touched, and what you saw from the moment you first encountered me.”