Sleep of Ages Trap

From Xanathar's Guide to Everything, page 114.

Simple trap (level 11-16, deadly threat)

When a sleep of ages trap activates, a pressure plate unleashes a spell that threatens to send intruders into a deep slumber. The dungeon's guardians can then more easily dispose of the sleepers.


 * Trigger: Stepping on the pressure plate triggers this trap.
 * Effect: When activated, this trap casts a Sleep spell centered on the pressure plate, using a 9th-level spell slot.
 * Countermeasures: A successful DC 20 Wisdom (Perception) check reveals the pressure plate. A successful DC 20 Intelligence (Arcana) check made within 5 feet of the pressure plate disables the trap, and a check with a total of 10 or lower triggers it. A successful Dispel Magic (DC 19) cast on the pressure plate destroys the trap.