Urgot is stupid how do you beat him

I played trynd to negate his ult and it helped but he can 1v4 a fed cait, cho trynd and our support. without his ult

I started building LS to counter his thornmail but that didnt help he had to negate crit.... ffs he wasnt even fed....

Note - mid was afk.

Edit - I was under the turret once i realized how out championed/rioted i was a like 1 min 30 sec

Edit - I know I dont have any armor but i was focused getting the core built