Chance upon entering a room to slow down or speed up every enemy and their attacks. The chance to slow enemies is quite higher than the chance to speed them up.
Quote
"I think it's broken"
Effects
Every 4th newly discovered room, the Broken Watch slows all enemies and their attacks down but has a rare chance of speeding them up instead.
The effect is lost upon leaving the room, and not gained again if re-entering it.