Ok, here's my plan.

Ulthok has high DEX (DEX: 19 Missile Adj:+3 )so he is skilled at throwing things. He'll position himself near the creature that past him that is headed toward Althena (#5) and standing with #5 on his right and #6 to his left. He pulls two flasks of Oil of Fiery Burning. With one in each hand he'll throw both so one hits the 5 from behind(backstab bonus) and other hits 6 head on. "When this oil is exposed to air, it immediately bursts into flame, inflicting 5d6 points of damage to any creature directly exposed to the substance (save vs. spell for half damage). If hurled, the flask will always break. Any creature within 10 feet of the point of impact (up to a maximum of six creatures) will be affected."
He'll turn invisible then, move away and get in position to attack another creature.

I hope to hurt two creatures.

Sound good?

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I saw that Sirene has Disintigrate.

Disintegrate
(Alteration)
Range: 5 yds./level Components: V, S, M
Duration: Instantaneous Casting Time: 6
Area of Effect: 1 creature or Saving Throw: Neg.
10 x 10 x 10 ft. cube

This spell causes matter to vanish. It affects even matter (or energy) of a magical
nature, such as Bigby's forceful hand, but not a globe of invulnerability or an antimagic
shell. Disintegration is instantaneous, and its effects are permanent. Any single creature
can be affected, even undead. Nonliving matter, up to a 10-foot x 10-foot x 10-foot cube,
can be obliterated by the spell. The spell creates a thin, green ray that causes physical
material touched to glow and vanish, leaving traces of fine dust. Creatures that
successfully save vs. spell have avoided the ray (material items have resisted the magic)
and are not affected. Only the first creature or object struck can be affected.
The material components are a lodestone and a pinch of dust.

She could pick a creature near her and make it go poof!

I'm plumping for the Cloudkill option at first, as it will effect multiple targets and does cumulative damage. And it's a great spell. Think of it is AD&D's version of bugspray.

Disintegrate I'll have to save for later!

I don't want to prescribe what you should do with Ulthok but don't let yourself get cut off from the others.

Cloudkill:

Range: 10 yds. Components: V, S
Duration: 1 rd./level Casting Time: 5
Area of Effect: 40 x 20 x 20 ft. cloud Saving Throw: None
This spell generates a billowing cloud of ghastly yellowish green vapors that is so toxic
as to slay any creature with fewer than 4+1 Hit Dice, cause creatures with 4+1 to 5+1 Hit
Dice to roll saving throws vs. poison with -4 penalties or be slain, and creatures with up
to 6 Hit Dice (inclusive) to roll unmodified saving throws vs. poison or be slain. Holding
one's breath has no effect on the lethality of the spell. Those above 6th level (or 6 Hit
Dice) must leave the cloud immediately or suffer 1d10 points of poison damage each
round while in the area of effect.

We are surrounded and intermixed with creature so some of us will be caught in the cloud too.

If Sirene takes out #9 which is almost on Althena, Ulthok takes out 5 &6 that clears the center and maybe we can move to the stairs.

Cor and Rayne will occupy their attacker. If we get rid of 5,6 & ( we can double team other creatures and beat them down.

Sirene can deliberately hold her action until everyone has retreated to the stairs, which will mean that there is no friendly fire.

In my opinion, if individuals do try and slug it out with these bugs, they will die. We need to do lots of damage in a short amount of time, which means we need big, flashy area of effect spells.

Agreed, one on one we cannot match them. Everyone should use their action to back away and parry any attack; not turn and flee. Furthest away start and everyone falls back as the line gets to them leaving Cor the last one picked up. One nice cloudkill cast and we wait on the stairs

Well if that is going to be the plan, shouldnt someone like our leader announce it openly in game? That way the characters know what they are suppose to do.

Hmm was that a hint? Ok, I will post our plan and see if we can pull it off.

Your gonna run away! What kind of Heroes are you!
Scardy Cats, Scardy Cats, run run away

Also aren’t ya forgetting someone hmmmmm...................

I would suggest to run towards the sword protecting Althena. One it is in her hand we may get a chance against these things. But I say Only Althena should touch it. We have had to many tempatations on the way here, from the sword trying to get one of us, other than Althena, to take the sword for their own. that I KNOW is a bad idea.

No need to worry about Sirene, as she's invisible and flying. Even if the bugs can fly and sniff her out, she has Mislead up her sleeve (and can shift too).

I was planning to stay in the open and rain down merry hell from above.

Two questions..........
1) What type of Elemental are you calling?
2) unlike the Cleric spell Conjure Fire Elemental you need the following to conjure one

Fire: Need a considerable source of fire
Water: Need a large amount of water
Earth: Need a large amount of loose dirt
Air: Need alot of air (This type is your best bet but be warned it will take alot of the air out of the room and stairway making it hard to breathe for everyone)
Feel free to revise your post if desired as I will not be posting till after the Cowboys/Giants late game tonight

Seems a fire elemental would be a good source of fire for the conjuring of another.

If she tried that she would first destroy Sirene's Elemental as she would draw its fire, or life energy so to speak, into a new Elemental.

Second Sirene's Elemental is living magical fire not normal fire, and per the spell, the way I read it, she needs a large source of normal fire to begin the process.

guess I will revise it as soon as I get back, not home long, headed out grocery shopping...since Sirene is flying I will use fireball...I will call out to her warning her I am using it and aim it at the mass of creatures, when the rest of allies are out of the way