The party finds a demi-lich and via Knowledge check recognizes its Torpor characteristic. The melee'ers surround it and proceed to attack it. How would you handle initiative?
The Torpor description states (paraphrasing) that the creature only attacks if it is attacked or if its treasure is disturbed. The party has deliberately avoided bothering the demi-lich's stuff.
I could see four possibilities, but maybe there are others:
1) The PC's get a full round of attacks, as the creature would not react until it had been assaulted. Then initiative is rolled.
2) The PC's get the initiative, but the demi lich goes in the same round right after them.
3) The PC's get a surprise action, but initiative is otherwise rolled normally.
4) Initiative is rolled normally with no surprise.
Given a demi-lich's powers, a lot may ride on this decision. I didn't see any prior posts on this issue or official stances on it. Anyone GM'd a module with a demi lich have an opinion on this?