Polyhex Killway
From Transformers Wiki
The Polyhex Killway is a gladiatorial arena where prisoners of war are brought and made to fight each other for the amusement of Megatron and his followers. It is most presumably located in Polyhex.
Fiction
Transformers vs. G.I. Joe
A group of Autobot and G.I. Joe prisoners were transported by Astrotrain to the Polyhex Killway. There, they were forced into a battle royale with Destro and Zartan manipulating them via some kind of remote control while Megatron and his guests watched. Expelled from the Garden