Tryndamere Ultimate Change
I feel that Tryn's 5 seconds of invulnerability are just so damn long and annoying. Even Kayle's ult only lasts 3 seconds and sure it prevents CC but in lane Tryn can just look at you and BOOM! He's dived you. There's no counter unless you just dance around turret over and over or have some sort of stun, which many top laners don't have.
Change: After activating, Tryn cannot be damaged for 2.5 seconds, during which he restores 15/20/25% of his maximum HP (+ 200% Bonus AD) health.
It can be passive/active, doesn't matter. Just change so it's not an issue. Sure he's vulnerable after the 5 seconds but he can just Q since he has max fury from his ult and restore 200-300 HP and you can't fkn kill him.

So that should keep you alive. If not, then you deserve to die when you're at a % of health he can kill you in 5 seconds in a turret dive.