Heat:Rumble gains Heat each time he uses a basic ability (20 for Flamespitter, 20 for Scrap Shield, 10 for Electro Harpoon) and loses 10 Heat per second after not using any abilities for 4 seconds, increasing to 20 after another 2.5 seconds of still not doing so.
Danger Zone:Rumble's basic abilities are enhanced when he is at/above 50 Heat.
Overheating: At 100 Heat, Rumblesilences himself for 6 seconds (cannot be cleansed, duration cannot be reduced) While silenced, his basic attacks deal 25 - 110 (based on level)(+ 30% AP)bonusmagic damage each while his Heat decays back to 0 over the duration.
Two consecutive Electro Harpoon hits on the same target cannot reduce enemy movement speed below 110, reducing non-linearly when going below 220 (gets closer to 110 the stronger the slow, varying between 110 and 120 if the target didn't purchase Boots of Swiftness)
Active:Rumble deploys rockets down the target path (can be fired in any direction from any point within range) landing in a line over 1 second and lasting for 5 seconds. Enemies within the rocket line take magic damage every second and are slowed by 35%.