Vestibule

The Vestibule is an area in Kell's Fall where a cracked archway leads into the Revenant Plane, a mirror reflection of the fortress. Entering the Revenant Plane grants a Refracting buff that lasts 2 minutes and 10 seconds, and it pauses when you return to the standard realm. When the timer runs out, the buff becomes a Shattering debuff that damages and eventually kills a player who stays in the plane. Leaving before the timer expires avoids this, and re-entering refreshes the Refracting buff.