Cannon Blast 150 yd range — Launches a cannonball at the target. Inflicts 1000 Siege damage and generates 6 to 10 Heat. Instant
Incinerating Blast (10 Heat) 150 yd range — Consumes all of the cannon's Heat to launch a massive ball of fire at the target. Inflicts 1000 Siege damage plus additional damage per point of Heat. Instant (1.5 sec cooldown)
Patch 3.3.2(2010-02-01): The cannon now kicks players from their seat and becomes unmountable at the end of the battle.