Bottle & Jug
Located in Sigil’s Hive Ward, the Bottle & Jug is a notorious bar staffed by over a dozen Ygsardian trolls, owned and operated by a sour human man named Barl Hoxun. The place is kept very dark, lit only by weak oil lamps. Hoxun uses the hidden arena in the back to pit challengers against his son, a cyclopskin named Akra, selling tickets for 5gp a piece.
For more, see In the Cage: A Guide to Sigil p. 107-110.