OOC:
Stormsong wants to have the pursuers gather in a cluster in the tunnel to the bellows room. To prepare, he suspends the dead flamskull from the end of his spear with twine, covers it with his cloak and casts the light cantrip on it, choosing a greenish light similar to a live flameskull. After Kama runs through, he'll uncover the skull and have it "float" up in the mouth of the tunnel. With minor illusion hell project the skull's voice commanding them to stop and gather here for his orders. He'll be hiding around the corner.
Xora and Gimblyn can pick them off as long as they stay in the tunnel. If he can affix his spear somewhere and join in the killing at range, he will, otherwise he will hold the spear.
Once it looks like the ghouls are on to him, he'll cast faerie fire into the group.
What do you think? Performance roll?
Not sure what they roll to save against a sound illusion. DC13.