Much fighting continued.  I penned the grey dwarves in with a wall of fire, and was then attacked by the cultists who had come in through the door next to me, but used my gnomish magic to disappear from their eyes when the first one hit me, so the rest missed.  I saw Thorg finish off the bulette rider, and then go and wait for the grey dwarves to come through my wall of fire.  Invisible, I then moved around the back of the cultists and killed one with a sneak crossbow bolt, while Arielle finished off the rest.  Arielle, Sorrel and Feyabelle then vanished through that door, while I went over to help Thorg against the grey dwarves, who had still not emerged.  Thorg went through the northern stone doors, and was hit by a crossbow bolt from a concealed arrowslit so some of them were still alive.  I conjured some smoke mephits from my pipe, and sent them through the wall of fire to attack any living grey dwarves, but they soon returned, so I dropped the wall of fire.  We found the charred remains of three grey dwarves, but no sign of the other two, so assumed that they had turned invisible and sneaked past us – hopefully to flee into their deep diggings.

I guess we had better go and find out what has happened to the other three – they have been gone for quite a long time.