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.
Threats to Mordekaiser with this build
|Evelynn||You can destroy Evelynn once you get Rylai's. You will get out pressured early. Just farm and wait for your Rylai's powerspike.|
The reason I go Stormraider's is that Mordekaiser does enough damage to proc it fast enough and it adds mobility to his kit. He also does not need the added damage from Thunderlords or Deathfire but they are both acceptable options but I prefer the massive burst of movement speed.
Runes are very variable. I go these runes for early game and jungle clear.
9X Magic Penetration Marks
9X Armor Seals
9X Ability Power Glyphs
3X Ability Power Quints
Movement speed quints, magic resist glyphs and scaling magic resist glyphs are very viable.
You can also go AD marks for even faster jungle clear.