Thunderstone Cascade Trap
Level 7HazardHazardUncommonMediumLegacy
AC
26
HP
54 (BT 27)
Speed
0 ft.
Perception
+0
Fort
+15
Ref
+13
Will
+0
Stealth DC
15
Immunities critical-hits, precision
Recall Knowledge DC 25 (arcana)
Abilities
Thunderstone Explosion↺
Trigger The trip wire is disturbed
Effect Several thunderstones bounce down the stairs and explode. Each creature within 10 feet of the lower half of the stairs takes 6d10 sonic damage (DC 24 fortitude save). Creatures that fail this save are additionally Deafened for 1 minute; creatures that critically fail this save are instead deafened for 1 hour.
Disable DC 27 thievery (expert) to safely cut the trip wire
A trip wire halfway up the stairs releases half a dozen spherical thunderstones that bounce down the stairs and explode.