Let's Make Mordekaiser's Kit Healthier and More Interesting

And thematically coherent! Make his movement speed scale inversely with his shield hp. He can be fast but vulnerable without it and slow but beefy with it. It makes sense if you think of him building up a metal shield around himself because it's going to be heavy. He'll still have trouble sticking AND doing damage, but less trouble getting away while taking damage. You can tweak the shield generation/damage/movement speed so that he's reasonable and not just fast (and thereby sticky) while focused.