This is my first time going through Durlag's Tower, I haven't had any major problems up until this point where the four Warders must be fought. The party I have for this is:
PC Illusionist/Thief (Lvl 5/6) - Protector of the Dryads +2 (Shortbow)
Ajantis (Lvl 6) -Kondar +1 (Bastard Sword) + Shield
Minsc (Lvl 6) - Spiders Bane +2 (Two Handed Sword)
Rasaad (Lvl 7) - Dual Wielded Rashad's Talon +2 (Scimitars)
Branwen (Lvl 7) - Ashideena +2 (Warhammer) + Shield
Dynaheir (Lvl 7) - Sling of Unerring Accuracy
I have a healthy stock of all kinds of ammo, Wands of Fear, Heavens, Fire, Monster Summoning, Paralysis, Magic Missiles, Lightning, and Frost, and a large assortment of potions I've mostly just hoarded up to this point.
Prior to battle I've been casting Chant/Bless/Protection from Evil 10" Radius/Defensive Harmony and keeping Zone of Sweet Air at the ready, but I keep getting unnacceptable losses.
Any tactical advice for this battle with this group make up would help. Both arcane casters have a significant number of spells available, Dynaheir mostly offensive, and PC mostly support.