At the bottom of the lift shaft, we were confronted with a large doorway festooned with diabolical imagery and infernal writings, through which overwhelming evil radiated to my paladin's senses. Seemed like we were at our goal. Casting our last buff spells, we promptly kicked the door in and were confronted with the portal's final defences; two Ice Devils, two Amnizu, one Barbed Devil, one Erinyes, two Orthons, two Bearded Devils, two Malebranche, and a Barregon (the DM recently discovered Dicefreaks Gates of Hell material, from which he stole the latter).
Laying down a solid fog halfway across the room, I was able to stall the Gelugons, Gate Devils, and Barregon for a few rounds while everyone focused all their efforts on the titanic War Devils, who got the Duskblade down to 1hp before the Deva was able to rescue him with her carefully hoarded Heal SLA, but we killed them just as the Solid Fog was dispelled and the Ice Devils (of which there were now three) moved to flank us.
Most of the party went to fight this new threat, while myself and the Erinyes pushed ahead to engage the Hamatula, suffering a storm of arrows from the Orthons and evil Erinyes as we did so. No sooner had we slain it, however, than did one of the Ice Devils peel off to attack us - I kept it busy myself while the Erinyes flew over to deal with the archers, using its massive bulk for cover against their attacks.
The other two Gelugon found themselves blinded by the Holy Aura that the Deva had put on us, and after firing a few random cones of cold that had little effect, had no choice but to retreat, allowing the rogue/wizard to rush the Barregon while the others helped deal with the archers.