Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Mordekaiser is well known as a tank. So much so that some people even rumor that he is the best tank in the game. But many overlook how he can change the tide of battle by killing opponents. Mordekaiser has a powerful moveset that grows even powerful when given the ability to kill opponents like other DPS Champions. Built around lifesteal and attack power, with hints of haste. This Mordekaiser build also gains a healthy amount of HP from the Frozen Mallet and Sunfire Cape. It also offers Mordekaiser enhanced escape abilities with Mercury's Treads, covering a major weakness of the Master of Metal.
This build may feel clunky at first for veterans of Mordekaiser who are used to tanking. Mordekaiser is truly meant to be a tank, but this build will abuse that while maximizing how well both Mace of Spades and Mordekaiser's survivability scales with attack power and lifestealing respectably. Because of these, I highly caution that you treat this Mordekaiser like you would any HP heavy DPS. Play carefully and abuse Ghost, CotG and Ignite to gank your way to MVP.
This build follows the basic skill build: Siphon, Mace, alternate, CotG, repeat, pick up Creeping Death, finish with CotG. Use Siphon to weaken opponents and then when you feel comfortable, surprise them with a quick Ghost charge, letting everything go on them. Once you get your Frozen Mallet, hold off on rushing opponents and instead abuse the high health you should have by then to get close. Mordekaiser is still meaty enough with this build to tower dive and rush characters who even have slows.
This build will surprise enemy tanks who may think they can out DPS you, as well as possible gankers who will be fooled into thinking your lower than normal HP leaves you weaker than other Mordekaisers. Of course, every build is alterable, so don't be afraid to modify this depending on the opponent. Sunfire Cape and Phantom Dancer are easily replaced, and Bloodthirster is also optional but strongly suggested. As final words, Abuse Mordekaiser's strengths with this set and as always, look out for the weaknesses. Good luck, and reap the souls of the damned!