Resonating Crystalline Spike
A cluster of indigo crystals growing from a cavern ceiling that reacts violently to rhythmic vibrations or loud sounds, releasing a devastating sonic boom.
Resonating Crystalline Spike
Defenses
Detection
“Clusters of jagged, translucent purple crystals that pulse with a faint internal bioluminescence. The floor beneath them is littered with the pulverized dust of smaller crystals and the cracked remains of previous cave dwellers.”
Standard Engagement
A creature moves within 15 feet of the crystals while wearing medium or heavy armor, or anyone makes a loud noise (such as casting a spell with verbal components or shouting) within 30 feet.
None
The crystals require 1 hour to stabilize and grow new vibrating facets before they can trigger again.
When triggered, the crystals emit a piercing shriek in a 20-foot burst. All creatures in the area take 4d10+7 sonic damage and must attempt a DC 21 Fortitude save. On a failure, a creature is Deafened for 1 minute; on a critical failure, the creature is also Stunned 1.
If a creature deals sonic damage to the Resonating Crystalline Spike, the hazard immediately triggers its Shattering Resonance effect as a reaction, even if it has already triggered once that day.
Turn Resonating Crystalline Spike into a sheet
A high-res, share-ready sheet you can post or print.