This spell enchants any single room no larger than the area of effect. When any creature larger than a normal rat (larger than one-half cubic foot or weighing more than three pounds) enters the room, shrill shrieks begin to emanate from the walls. The shrieks persist for 2-5 (1d4+1) rounds. The walls do not undergo any physical change.
The shrieks can be heard only by creatures inside the room. Creatures hearing the shrieks experience no ill effects on the first round, allowing them time to leave the room or cover their ears. Silence, 15' radius protects against the effects.
Creatures who remain in the room during the second or subsequent rounds of the shrieks who have not protected their hearing are penalized as follows: