HydraZ, please refrain from personally attacking or insulting other forum members. Thank you.

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No deathfire grasp and you take liandry which deals dmg based on current health when u want to kill a low-hp target.wow just wow.

Your goal as Morde isnt to be extremely AP heavy with items like Void Staff and Rabadon's. I can also see why you would try for DFG. But the the problem is that once again this build isnt about goint AP Heavy like your suggestions.Your Goal is to do enought damage while remaining a tanky threat. Your ghost is the jewel which makes Morde what he is and the longer you are alive the longer your ghost can screw the enemy over.Although Randuins is a good item with great Armor and HP What really helps you keep good sustain is a Warmogs.The one start is the only start because one way or another you need to start on your build with Morde's hp costs early game being pretty significant.If you want to go "defensive" (you are probably anticipating losing hard). I appreciate the critisicm and as I have already mentioned in my guide its my first and probably last one.I really don't want to go back and add coding solely because I'm lazy.I hope I addressed some, if not all, of your concerns.

You cannot max an ability at level 8 and you haven't select all 30 points in your Mastery Tree so you need to add two points ine the defense Tree (I recommend you Block , Unyielding , Recovery , Veteran Scars and Juggernaut ).
You miss out great purchase options like Deathfire Grasp, Rabadon's Deathcap or Void Staff and I would say Randuin's Omen > Warmog's Armor. You just mention one start option and this one is pure offense, might consider something else.
Your guide just consists of text and if you've already looked at some other guides here on this website you might have seen that the guidewriters used coding. You can check out this and can use the stuff you can find there as long as you give credits.