Originally Posted by dokdek
Whats your build/runes with him
Ehm for masteries I use 9/0/21 on him and for the runes i use Magic pen marks, armor seals, magic resist/lvl glyphs and flat ap quints. I'm prety sure there are way better rune setups, though I don't have the IP available to make a Mordekaiser page. (I actually think he's quite boring, and I really had to motivate myself to play more games with Mordekaiser to get more footage)
I normally start with boots and 3 hp pots, to get some lain sustain, and try to get a hextech revolver the first trip home for more sustain. Then I usually rush a Lich bane (getting sheen first) and if I get some kills I might get a Rabadon's Deathcap afterwards. Though, if your having a hard time, and not getting farm/kills you'd better go for defensive items like Rylai's and Force of Nature.
Though, I'm only a 1600 elo player and I don't even play Morde that much, so I think you should try and find a better guide on Leaguecraft, Solomid or Mobafire.