[Champion Concept] Taranis Zu, the executor of Runeterra
First thing I'd like to say is that it isn't a type, executor is correct.
Story: What if the planet was sentient? Taranis, who one day descended in a lightning strike from a particularly terrible storm says it is, and that it is his duty to execute Runeterra's will. Whether this is true or not cannot possibly be confirmed, although the ominous natural phenomenons occurring in the presence of Taranis make the thought of such a thing particularly disturbing. Yadda yadda, now he's a champion fighting for Runeterra on the rift. He also chucks magical rocks at people.
Role: Magic Damage Marksman
Passive: Ball lightning All damage done by Taranis is converted to magic damage. In addition, the strange phenomena known as ball lightning naturally occurs around Taranis and from enemies he has killed. Being volatile in nature, they do not last very long, decaying away in anywhere between 3 and 10 seconds. Whenever an enemy takes one of Taranis' autoattacks within range of ball lightning, it resonates electricity, and while decaying immediately after, fully transferring all damage to everything in a small radius around itself, and also triggering other ball lightnings in range. Damage does not stack.
Q: Water Spout Mana cost: 50 at all ranks Cooldown: 8 seconds at all ranks A water spout occurs over land, covering a zone with water. Enemies struck by either Ball lightning or True Force of Nature while standing in ground affected by water spout are briefly stunned for 0.5/0.75/1/1.25/1.5 seconds.
W: Sinkhole Mana cost: 80/80/90/90/100 Cooldown: 22 seconds at all ranks After a slight delay, the ground opens up, swallowing everything above it. The area acts as inaccessible terrain, and champions cannot go over it. All champions caught in it, regardless of team, are stunned for the duration of the sink hole. The diameter of the sinkhole increases per level, to a total of about the size of a jungle path.
E: Pocket Storm Mana cost: 100 at all ranks Cooldown: 18/17/16/15/14 seconds A small tornado rises up beneath one of Taranis's many enemies, lifting them up for 3 seconds. While they are in the air, they are untargetable and cannot be damaged.
R: True Force of Nature Mana Cost: 200 at all ranks Cooldown: 60/55/50 seconds Range: Global After a slight delay, a powerful blast of lightning strikes the ground where Taranis has called it. It deals 400/600/800(+1.0 bonus AD) magical damage to all enemies struck. Deals quadruple damage on maokai because how dare he call that spinny circle protection magic bullshit force of nature.