Spell for 6th Level Sorcerer (Undead Expected)

[Create Mr. Pitt]

I get one spell. Void-touched wildblooded domain of starsoul. Normally it'd be stinking cloud, but we expect to face a lot of undead in our upcoming dungeon.

My second level spells are Glitterdust, Create Pit, Burning Arc, and Mirror Image (one came from a page of spell knowledge). I have spell focus conjuration and evocation (in addition to cwi and toughness) at 7 I plan to take augment summons and, probably SM III.

So since I think I have to wait to get stinking cloud, my options are spiked pit (possibly swapping out create pit), aqueous orb (the frontrunner), fireball, or fly. (I like ice spears but it doesn't become as useful as spiked pit until 8th level when you get two spears).

Anything I am missing? Any thoughts on other good spells against the undead. Passing on haste because we have a bard and I don't want my only third level spell to be a soon-redundant buff, but maybe.

I tend towards bf control and SoS, the remainder of the party is a bard, ranger, and melee-focused alchemist.

[Trimalchio]

Undead ignore non-lethal damage.

Command undead is a solid level 2 spell.

Fireball will be the most damage. Control might be sleet storm or even air geyser for something different..

[tonyz]

Fly is really handy for tactical mobility.

Fireball is perhaps redundant with burning arc, both AoE fire spells, though you could swap burning arc out for command undead - normally too situational for a sorceror, but if you know lots of undead are forthcoming, it might be worth it.

Major image might be a possibility - illusions are seriously good battlefield-shaping spells if used right.

Dispel magic is never a bad choice, nor is slow.

Halt undead is pretty powerful, though maybe not worth a third level slot when you could command undead with a second-level slot.

Consider clairaudience/clairvoyance to let you scout ahead with great effectiveness.