SCP-513 - A Cowbell

SCP-513 is a rusty cowbell. If SCP-513 is rung, the player who rang SCP-513 will begin to experience a loss of sanity and stamina and begin seeing a shadowy figure stalk them where ever they go -- designated SCP-513-1. Players will also begin to feel drowsy after hearing SCP-513. If a player falls asleep while under the influence of SCP-513, the player will be attacked in their sleep by an SCP-513-1 instance. Sleep may be induced quicker by wearing SCP-714.

Based on SCP Wiki's SCP-513