Managed to get the party in a swamp? Put them in a real pickle:
Dread Swamp: Not only does the rot and stagnation of this place recreate the stench of a troglodyte to nauseating perfection (save vs. Poison each hour or gain a -2 on "to hit" rolls - the effect is not cumulative), but the water and damp vapors actually corrode metal in much the same way as the touch of a rust monster. After 1-6 hours spent in the swamp, all non-magical metal items will become fragile and prone to destruction. A single successful hit with a metal weapon destroys it. A single successful hit against metal armor destroys the armor. Metal buckles and hasps give way from weight and pressure. And so forth. Even if later taken out of the swamp before being subject to stresses enough to destroy them, the items are forever damaged and will suffer the same fate under the right circumstances. Magic weapons and armor have a 10% chance per "plus" of not being affected. Those that succumb will lose one "plus," but no more. If this loss renders the item non-magical, use the guidelines given above for normal metal items.
Whirlwind of Scorpions: Desert twister with a swarm of scorpions whirling around within. Victims caught inside take damage from the whirlwind and from stinging scorpions each round. Brush off the "Insect Swarms" entry and give the little critters Giant Centipede poison to liven things up a bit.