Banshee's Symphony

Stealth

+30 (legendary)

Disable

Thievery DC 42 (master) to pierce the invisible larynx so precisely that the magic releases in a trickle before the trap activates, Thievery DC 44 (legendary) three times to deconstruct the larynx while the trap is active in such a way that it tears the spell apart, or spell DC 38 (9th level) to counteract the wail of the banshee before the trap activates

Scream [Reaction] Trigger Three or more living creatures remain within 100 feet of the trap for 6 seconds or longer.

Routine

(1 action) The trap uses its action to force one random creature that failed its save against wail of the banshee last turn to emit a wail of the banshee with the same statistics as the initial one.