I also forgot to mention my pre-teleport actions, which would be to activate Haste on all of us, which should help add a bit of speed, though probably not enough.
And when Vist says everyone should concentrate their attacks, should they concentrate on the (hopefully stunned) Cornugon, or on another enemy if he's actually stunned for the 5 rounds? If he is stunned, I could probably tear through him pretty handily, even with his fire immunity and acid resistance, but then other enemies are free to keep attacking.
Also, Oslecamo, I assume the fireball and ice storm effects are SLA's, right? Do they need to roll against my SR?