[DAV spoilers] Pitch me your Mournwatch Rook ideas!

Hi folks! So I’ve been hardcore struggling to figure out how or why baby Mournwatch Rook was abandoned in the Necropolis. Best bet is some hand wavy ✨ it was blood magic related ✨ thing. My Rook is a Qunari and his mother was a Tal Vashoth who joined the Mournwatch. But that’s as far as my brain will take me apparently lol.

Thoughts or suggestions?