My idea for a new Champion

Therox (th-air-ox) the Siege Master

Abilities

Passive Siege Master: Therox's basic attacks increase damage taken by buildings by 15%, but increase the fire rate of turrets by 50%

W Catapult: Therox promotes a nearby siege minion to a catapult, giving an area of effect attack, along with increased range and damage, but massively lowers its hp, which will follow Therox around. Second activation: the catapult sets up for 1.5/1.25/1/.75/.5 seconds before it starts to fire at anything in range, prioritizing turrets.

Q Crew: Therox drafts a nearby caster minion into a crew member for the catapult, LOWERING the catapults attack speed but adding a 10/20/30/40/50% damage increase

E Armor up: Therox targets a nearby champion or melee minion, increasing their armor and mr by 10/20/30/40/50 + 10 per every 75 bonus mr or armor. Lasts 5/6/7/8 seconds for minions, at level 5 becomes permanent. Lasts 2/3/4/5/6 seconds for champions

R Ballista: Therox channels for .75 seconds, upgrading his catapult to a ballista for 10 seconds, giving it increased attack speed and 10% armor penetration, but it losses the ability to attack turrets for the durration