Mist Lord

At the start of the match, the Mist Lord's chamber will be sealed and inaccessible for a period of time.

When you begin the challenge against the Mist Lord, a barrier will form to block other Gyldhunters from entering. Interact with the barrier when nearby to exit it.

Note: The Mist Lord will go berserk after being in combat for a while, so make sure to defeat it quickly.