Mordekaiser Guide

Tips for Playing Against Mordekaiser

-Mostly you should be watching that he doesn't get a lot of passive damage on you, as it does percent max health damage.
-If you stand in minions, his Q will do less damage.
-If you make distance from him as he gets his passive, you can wait it out and W back in as it is expiring. If he's really stacked on conqueror, consider waiting an extra second, for that to expire too.
-The beginning and end of his ult cancels your ult, so be careful not to use it at the same time as him, or at the very end of his ult. It'll also remove your Q.
-Your W visual disappears when his ult expires, but it actually still goes off. If he has E up, you can stun him and then W out, and if you timed it right you'll escape his ultimate, even if there's enemies waiting nearby sometimes.

Swiftness Boots

Swifties are great in general, but they're REALLY good against Morde, as they help escape him, especially if he built Rylai's first. With Swifties you can usually dance around him, meaning he's unable to catch you, but he's unable to run either, and when his passive expires you attack. Morde will usually build these too, and though his base MS is low, his passive gives him MS, so I think they're super necessary.
Hollow Radiance

Hollow is really good against Morde, as it gives you survivability, and mitigates Morde's ability to constantly shove the wave into you.
Heartsteel

Really great when ahead. If you get early kills and can bully Morde, or if the enemy has a lot of squishies (and especially if they don't have much %HP damage either), I would build HS instead of Hollow.