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 100% Heat, he starts Overheating, granting his basic attacks bonus damage, but making him unable to cast spells for a few seconds.
Rumble torches opponents in front of him, dealing magic damage in a cone for 3 seconds. While in Danger Zone this damage is increased.
Rumble pulls up a shield, protecting him from damage and granting him a quick burst of speed. While in Danger Zone, the shield strength and speed bonus is increased.
Rumble launches a taser, electrocuting his target with magic damage and slowing their Movement Speed. 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.
Rumble is a young inventor with a temper. Using nothing more than his own two hands and a heap of scrap, the feisty yordle constructed a colossal mech suit outfitted with an arsenal of electrified harpoons and incendiary rockets. Though others may scoff and sneer at his junkyard creations, Rumble doesn't mind—after all, he's the one with the flamespitter.