[Indemaijinj]

The "toxic cloud" is called Cloudkill.

Mages can also be kept at bay with weapons that do damage over time. Bolts of Biting and Acid Arrows are good for this.

Remember that spellcasters often use protective magic. Use spells like Secret Word, Ruby Ray of Reversal and Khelben's Warding Whip to strip enemies of spell protections (magics that protect against spells).

Use the almightly Breach (can be found in wand form too) to strip them of combat protections.

Many boss monsters are magic resistant too. Get over this by hitting them with three Lower Resist's. Load them up in a Sequencer to spare time.

Always have non-magical weapons at hand in case someone casts Protection from Magical Weapons. Also there is a creature that is immune to nigh anything but non-magical weapons.

Use True Sight or the thief ability Detect Illusion in order to dispel annoying protective illusions and expose invisible enemies.