[Lanthir]

I did the keep except for that part and waited a bit into TOB to do it. I do not think you actually can run into the portal till you kill them all. The modthode I used to get that last group is as follows if you want it.

Since you know where each of them spawn I set some summon Mosters between the beholder and the group setting them up a bit north of the Geni that pops in. I also had a diva summoned When they popped in I put everyone except the monsters on the genie then the girl. The monsters went to the beholder. They held him of long enough for me to get the other two down. Then I went after him then the others. Hope this helps