Rumble Ability (LoL): Electro-Harpoon
Electro-Harpoon Rumble
E

Range: 850
Cooldown: 6
Hitting an enemy who's already slowed by this ability increases the slow to 30 / 40 / 50 / 60 / 70% and reduces the enemy's magic resist by 20%. This Ability has 2 charges (6 second refresh).
Danger Zone: The harpoon deals 90 / 127.5 / 165 / 202.5 / 240 (+60% of ability power) magic damage instead and the slow and reduced magic resist are increased by 50%.
This is the reason I main Rumble, sort of how peopke like Fiddlesticks and Rammus, they have that one ability that just annoy's the living hell out of people.