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 a great champion in late game. Once you get his health regen high and his armor really high he can be very difficult to kill. The combination of a Force of Nature and a Warmog's armor make him a very good champion.
Very high health and health regen.
High armor and magic resist
Decent movement speed