LoL Champion Build Guides: Rumble

Rumble begins torching the area in front of him with his flamethrower, dealing 11.25 / 15 / 18.75 / 22.5 / 26.25 (+9.16% of ability power) magic damage to all units in a cone in front of him every quarter second for 3 seconds, up to a total of 175 / 210 / 245 / 280 / 315 (+110% of ability power) magic damage over the entire duration. Flamespitter deals 60 / 65 / 70 / 75 / 80% damage to minions. Rumble can move, attack and use other abilities while the flamethrower is on.

While in the "Danger Zone", this spell deals 50% additional damage.

Rumble creates a shield blocking 60 / 95 / 130 / 165 / 200 (+50% of ability power) incoming damage for 1.5 seconds. In addition, Rumble receives a 15 / 20 / 25 / 30 / 35% movement speed boost until the duration of the shield ends or is broken.

While in the "Danger Zone", the shield's strength and movement speed boost are increased by 50%.

Rumble shoots a taser that deals 60 / 85 / 110 / 135 / 160 (+40% of ability power) magic damage and slows the target hit by 15 / 20 / 25 / 30 / 35% for two seconds. Rumble gains a charge of Electro-Harpoon every 6 seconds and can store up to two charges at once. Each use of the skill generates 10 Heat. If the second taser slows an enemy that has been slowed by the first, the slow is refreshed and its movement speed reduction is doubled.

While in the "Danger Zone", the damage and slow percentage are increased by 50%.

Rumble can still use Electro-Harpoon if he is overheated as long as he has a charge.

Rumble deploys a barrage of rockets 1000 units down the target path, landing in a line over 1 second and lasting for 5 seconds. Enemies within the line of rockets take 140 / 210 / 280 (+35% of ability power) magic damage every second and are slowed by 35%.