Bregga's page

Can the Magic Mouth Spell activate if the thief is in stealth mode?
I know it states that it does not activate in magical darkness or if someone in invisible but it does not mention stealth. I am a DM pondering this question (yes I used DM but I am to old to change that habit).

I am wondering is there a list somewhere that states what a thief can back stab? Does anyone know if by the rules they can back stab undead? Dragons?