Every spell Rumble casts gives him Heat. When he reaches 50% Heat he reaches Danger Zone, granting all his basic abilities bonus effects. When he reaches 150% Heat, he starts Overheating, gaining bonus attack speed and granting his basic attacks bonus damage, but making him unable to cast spells for a few seconds.

Rumble begins torching the area in front of him with his flamethrower, dealing damage to all units in a cone in front of him for 3 seconds. Flamespitter deals 25% reduced damage to minions. Rumble can move, attack and use other abilities while the flamethrower is on.

While in the "Danger Zone", this spell deals additional damage.

Rumble creates a shield blocking incoming damage and receives a short movement speed boost.

While in the "Danger Zone", the shield's strength and movement speed boost are increased.

Rumble launches a harpoon, electrocuting his target with magic damage, slowing their Move Speed, and reducing their Magic Resist. Rumble can carry 2 harpoons at a time. While in Danger Zone the damage and slow percentage is increased.

Rumble fires off a group of rockets, creating a wall of flames that damages and slows enemies.