Final Terminus is an Octagon variant that takes design cues from several versions of Super Smash Bros' Final Destination. It can be played as a standard Octagon (if played in Slayer, there are invisible walls around the platform to match other Octagons), but the real excitement comes from the Super Smash Bros-inspired custom game.
The associated gametype - No Items Fox Only - is a Breakout variant with hammer starts, increased movement, lower gravity, and greatly increased knockback on melee, Spartan Charge, and Ground Pound. Players sent off the level can usually float or thrust back, so guarding the ledge and chasing your kills is a critical strategy!
The map supports up to 4 teams of 4 players each (if for some reason you like 16-player Octagon games), and is best with 2 3-player teams or 4 2-player teams.