Shriek Paste (Vial)

When smeared on a surface, it retains its same consistency almost indefinitely. When Bright Light is within 30 feet of the paste, the paste rapidly crystallizes and emits a shriek audible within 300 feet of it for 1 minute. If the Bright Light moves out of range, the shriek ends after 1d4 rounds. Afterward, the paste dries up and is rendered inert.