White Altar
Trap
Level 19 Solo Obstacle
XP 12000

The entrance to Moghadam’s lair is concealed within a trap.

Trap: The floor collapses when the altar is disturbed.Perception     DC 13: A character searching next to the altar before the floor collapses notices that it sits loosely within the solid stone of the floor—as if the floor and the altar were separate.     DC 25: A character searching away from the altar before the floor collapses notices a concealed seam where the floor meets the walls.     DC 25: After the floor collapses, a character notices a tremor in the ceiling (1 round before the ceiling falls).Trigger       If the altar or the skull is touched, the trap attacks.
AttackImmediate Reaction      Melee
Target: Each creature on the floor of this chamberAttack: +24 vs. ReflexHit: The stone floor collapses to rubble. The target falls 90 feet down into a pit, takes 9d10 damage, and falls prone.Miss: Half damage, and the target falls prone at the bottom of the pit.Effect: A 1-foot-deep pile of rubble fills the pit. The rubble is difficult terrain. Make a secondary attack against each creature in the chamber 2 rounds later.    Secondary Attack: +24 vs. Reflex    Hit: A false stone ceiling shatters and falls, dealing 9d10 damage and knocking the target prone.    Miss: Half damage, and the target falls prone.Countermeasures     A character adjacent to the open archway or the altar when the floor collapses can make a DC 25 Acrobatics check. With a successful check, the character moves back into the passageway or to the top of the altar.
     A character adjacent to the base of the pillar when the ceiling falls can make a DC 25 Acrobatics check or Athletics check as an immediate reaction to dodge the worst of the falling debris. With a successful check, the character takes half damage if the attack hits, or no damage if it misses.
     A character climbing or flying in the pit when the ceiling falls must make a DC 25 Athletics check as an immediate interrupt. With a successful check, the character takes damage as above but stays in place and does not fall prone. On a failed check, the target falls to the bottom of the pit, taking falling damage in addition to the damage from the ceiling.

Published in Tomb of Horrors, page(s) 113.