One of the great things with mordekaiser, is the lovely combo between "ignite" and "children of the grave". Theese two spells makes a nice combo because of the "50% reduced healing effect" from "ignite" and the dmg. over time effect from "ignite". "Children of the grave" does and fantastic dmg. output because of "50% reduces healing effects" from "ignite", and if you know how to play mordekaiser, you do almost have a 100% chance to kill your opponent. And you will get more hp from "children of the grave" when you use ignite at the same time as mordes ultimate.

To harras your opponents and stay alive make sure to hold your shield from "iron man" at max. Buy spellwamp when you have enough money, the spellwamp will help you to not loose too much hp when using your abilities. Spellwamp and hp regen is a good thing to Mordekaiser, it will help you to stay alive, keep yuor shield up and make sure to almost survive any gank if you have kept your shield up and hp from hp regen and spellwamp.