What if he was kind of like the rift herald where he's extremely durable unless you hit him in a weak point on his back? Then they could give him some insane damage while also allowing him to be tanky. Hell I think I'm going to work on an idea for this.
EDIT: Here's that idea.
Passive: Alchemical Shield Engine
A generator on Urgot’s back grants him massive amounts of armor and magic resist that scales off of his damage. If an enemy manages to attack Urgot from behind, the generator is disabled, drastically lowering Urgot’s armor and magic resistance for 8 seconds.
Q: Searing Kinetic Charge
Urgot fires a long-ranged projectile that damages all enemies it passes through (with 10% armor penetration) while applying DOT to anything it passes next to. If the projectile hits an enemy under the effects of Corrosive Concussive Shell, it explodes for bonus damage in an AOE.
Cooldown: 5 seconds.
W: Sentry Turret
(passive) Urgot’s sentry turret fires at enemy champions that come to close to Urgot. If Urgot’s Alchemical Shield Engine is damaged, the sentry turret is also disabled for 2 seconds.
E: Corrosive Concussive Shell
Urgot fires an artillery shell that deals minimal burst damage in an AOE followed by DOT and a slow for 2 seconds.
**Cooldown: **12 seconds.
R: Incendiary Strike
Urgot zooms out to fire a long-range missile that deals initial burst damage over a large AOE, followed by DOT (true damage) that lasts for 4 seconds or until the enemy exits the AOE.
Cooldown: 200 seconds