Heyho! My name's Soohy, and here, I'm going to present my build on Mordekaiser (offtank with a bit of AP)

This build has both of pros and cons, of which there are:

Pros:
*Alot of HP
*Pretty good amount of armor / magic resist
*Great HP Regen, which combined with two above gives great survivability in late game.
*Good farmer (like every kaiser -.-)
*Great for solo laning

Cons:
*a bit low amount of damage
*often has to ks to get kills in early game

For runes, I chose
*MPen marks, to expand kaiser's dmg a bit
*Dodge seals, to make him even more tanky
*MResist/lvl glyphs for more survivability in late game
*Movement speed quints since kaiser is pretty slow..

You can change quints and seals for hp ones, it's kinda your choice :)

I use 0/9/21 mastery tree, not much to explain...

Items!
My first item is always R. Pendant, since kaiser sacrifices his HP for using his spells, and it's good to have some regen early game. Next on I rush to sorcerer's shoes, to get more damage and movement speed. Next 3 items are focused on health and health regen. FoN -> Warmog -> Spirit Visage and you have around 120~ hp / 5 sec + passive from FoN. Last items are rylai's and randuin's omen. If you're facing heavy AD team, you may want to get a thornmail instead of rylai's.

For summoner spells I use ghost and ignite, since in early game ignite + ult is just a KABOOM! for finishing running foes. Other viable choices are also exhaust, flash...

I always try to harass other pplayers in early game by using E repeatedly and sometimes W at myself or minions. In full 1v1 fight, I follow the skill priority - E -> W -> Q. When my target is low health I trigger ulti and ignite.

I think that's for a while. My build is pretty short because there isn't really much to explain on a playstyle and to be honest, I didn't have much time to write much. To prove my build worthy, I'd like to show you some of my stats using this build.

Thank you for reading! :)