I don't have a template for hazards/traps (someone feel free to link me one), but here's a quick hazard for Rechan. My intent is to use it during a fight with a dragon when it hits bloodied (and roars, shaking the room). It would be best used to cover only part of a multi-room combat or with enemies who are larger and/or quite aware of the danger and able to cope.
I don't have the skill DC errata on this machine, so I'll fill in the skill DCs later:
Falling Stalactites
Hazard
Level 10 Lurker
XP 500
Hazard: When triggered, stalactites rain from above throughout the area in an initial attack. It then attacks a random target each turn, on its initiative, for five turns.
Dungeoneering - DC (Hard)
Perception - DC (Very Hard)
Initiative +5
Trigger
The trigger for falling stalactites can be random, caused by the actions of others, or timed. When triggered, it rolls initiative. Between the trigger and the falling stalactite's attack, characters in the area know that the stalactites are about to fall. On its turn, make an attack against every creature in the encounter area.
Attack
Standard Action
Targets: All creatures in encounter area
Attack: +15 vs. AC
Hit: 2d10 + 6 damage. If the target is Medium or smaller, it is knocked prone.
Sustain Standard: For the next five turns, a stalactite falls on a random creature in the area making an attack as above on that target.
Countermeasure
A character who makes a (Very Hard) Acrobatics check as an immediate interrupt is missed by the attack.
A character who makes a (Hard) Dungeoneering check as a minor action gains a +4 to AC against a stalactite attack on its next turn and gives this same bonus to any adjacent allies.
