i don't exactly remember how the last kit changes affected his numbers; he used to be better as a glass cannon mid lane. Now, i think he's meant to be more brawly. Early game, you probably want to build
, or if you're against a broken AD like Zed substitute
for hextech. Since the kit changes, you can probably get away with building a defensive item like Warmogs, Randuins, or Spirit Visage, but if you're significantly ahead you should just build damage.
I've yet to try it out too much, but i imagine that since his shield scales with health now that
into
+
would be pretty strong for him now. The weird thing is, it used to be much better to build resistances rather than health for him (complicated math, but it's true), but since the recent update i don't know :P
Morde isn't weak, he's just not up to date with the current game. He's strong against certain assassins, and people who rely on burst. He's a classic counter to LeBlanc, for example, and i have a lot of success with him against Fizz (it just takes practice to dodge his stuff; start
+
). The only people who really beat him in lane are champions that out-sustain him (Chogath, Volibear, Swain), have absurdly strong early all-ins and high mobility (Riven, Zed), or punish his lack of mobility (Azir, Heimerdinger). As has been the case since the beginning, Morde's biggest counter is jungle ganks, so always keep a supply of wards with you.
To answer your question, you probably want to lean more bruiser than glass cannon now. I did try Morde with Luden's Echo during the PBE testing, and it was absurdly strong on him (basically just added 100 damage to each time i used E). If you don't need Zhonya's, Luden's would probably be a completely valid choice.