Gate of Madness - Undead Lich not hostile

I rallied all 5 Gods with my H/H troup, I killed Shiro already (he came to greet me when I walked in), but now I can't kill the Undead Lich because he doesn't turn hostile. I have made sure I cleared all the temple area and the area before the temple. Is there something else I have to do to make him hostile?

Edit: It's a known bug, found it on wiki (didn't scroll down far enough first)

I think that when you try to do the coop you flagged your heros at the shrines, and when they took all, you went into the temple, so you had the bug.
If you want do that,, you need first take out the heros of the temple, and after you should go into the temple the first, because if heros attack licho or shiro before they say all, appears the bug.

Now you can only resign and try other time.