Like most fights, this one is a piece of cake if you make the proper preparations and watch the fight carefully. these are just some of the spells you should have cast before preceding up the stairs: prot. from evil 10' radius, defensive harmony, imp. inv. on everyone, blurs and stoneskins (for mages,) ironskins for druids, chant, bless, etc.
Summon some creatures to take some of the enemy attacks and to set off some of the traps that are lurking around.
Make sure to have plenty of Extra-healing potions in each character's quick-use slots and if necessary have a cleric sanctuaried running around healing people.
As far as mage spells go, focus on lots of damage spells - chain lightning, fireballs, etc.
Have plenty of breaches and pierce magics for the magic user(s) and have your clerics/druids cast insect plagues and the like to mess up the spellcasters. Whoever is fighting the enemy who wields the Celestial Fury should have GOOD saving throws.
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trux
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