Tallima: I do remember that I had a skeleton army at my command (maybe 100 skeles) and it wouldn't let me bring them into the final battle.
DubConqueror: Summoned creatures don't come with you in area transits. You should summon your summons inside the building but before bringing the villains into view [/spoiler avoidance].
*WARNING: Some spoilers may be present*
I knew they couldn't come with me. If only! :D
If I remember correctly, I got them all by turning all of the skeletons in the area just before Sarevok into allies.
I beat that game by turning everyone into allies. I used Algernon's Cloak (or something like that) that I stole off a guy early in the game and that let me convert almost any enemy into an ally. I may have had an evil cleric do the undead turning, though.
I loaded up BG2 last night. Can't wait to play some this weekend.