Colosseum
From Drunkapedia
Description
The Colosseum is a place to allow adventurers to pit their skills against increasingly more difficult monsters in a short time frame.
Adventurer's have 1 hour to complete all rooms in the Colosseum. This is currently one of the most difficult tasks in Dereth, and only a well-tuned team of high-level adventurers can make it to the end.