Ability concept: (inspiration Singed)

So i was watching some Singed game play and i thought..

how cool would his ult be if when turned on would create a wider gas stream. like gas coming out from behind him and out his left and right. Each stream would be its own source of damage.

Also if he was killed during his ult that he would explode into a gas ball. the damage would be based on missing Max mana. the duration would be based on Unused mana.

So basically with a Singed with Large amounts of mana as he is running around and have most of it spent if anyone killed him he would go, 'BOOM' leaving a gas cloud that could poxie another wave and cause some damage.

Or

he could have had a death passive added onto him: Above 50% mana on death his tank is dropped leaving basically a leaking gas canister Below 50% his tank would explode causing damage based on used mana.

because we all know fumes are flammable