Magma chamber (No, not the 1v1 map, the name just fits)

4v4 gamemode, map is about the size of TT

2 lanes surrounding a jungle, which has 4 arenas below it, viewable through the jungles transparent terrain.

You may not enter or leave an arena by normal means.

Towers/Minions grant half gold. When a kill occurs, the killer and the killed are both healed fully, have their cooldowns refreshed, and are warped into an arena. In the arena, outside spells are blocked (ex. karthus ult soraka ult). They remain in the arena until one of them dies. In the case of a simultaneous multikill, the killer fights them one at a time, with healing in between. Kills in the arenas by the original killers grant gold to yourself and everyone who helped you get them into the arena, as well as one stack of "Glory". Kills in arenas by the ones who were originall killed grant gold to themselves and one stack of glory to their entire team. Glory grants +1% ad, ap, and hp per stack.

If the nexus is destroyed, the game does not iinstantly end. Respawning is disabled for the team with the destroyed nexus. In order to win, you must destroy the nexus, and then ace the enemy team via arena challenges.