Cool Ultimate Idea

So recently i was watching a video by the league you-tuber Jeremy "Gaming Curios" where he explained the origins of the champion concept known as kadarin. I Caught my attention that this was was meant to be an ADC that operates on a heat system which i think is a great idea and really fresh concept that doesn't exist currently in league. So i was brainstorming and i came up with this idea for an ultimate which would add a lot to the champion.

My idea is that Kadarin would wear some sort of mech-armor victor-type technology and that he would have 3 or 4 cooling devices in his back. As he attacks he builds up heat and perhaps when he reaches max heat he gains some bonuses but becomes slowed or rooted (heat is the enemy of electronics and a mech-armor would be greatly affected by a lot of heat)

Anyhow, i propose an ultimate that would give the champion a choice about what to do with his heat. You would keep the heat and make use of the bonuses and let it cool down slowly OR he could hold down his R button to consume one of this cooling devices, completely cooling him after a Chanel time But most importantly.....the Cooling device now becomes charged or heated....and visibly glows on his back....It has now become a grenade that he can throw by Taping R, which then explodes in a cone in front of him and rains down shrapnel.

I think this is a cool idea because in league there isn't any Amo-based ultimate without cool-down which depends entirely on the players choice to load that bullet. It would add a new layer of planning and choices more meaningful than (my ult is up, lets use it) Because you need full heat in order to use the cooling and load 1 grenade, you would have to be effective in combat. However, it might be more useful to make use of the heat in other ways via bonuses or other abilities. You could also chose to store your heat for an incoming fight...saving up 2, or 3 grenades in preparation for a dragon fight or baron fight. Also the enemy can visibly see how many grenades you have saved up and how much potential threat you represent.

Overall, i think the idea of a Heat-adc type champion and a cool-down-less manual reload mechanic to go with that heat system is something really unique that could bring a lot to the plate.