Been trying a new build on Morde, and although unconventional, I find it really fun.
First, regrowth built into a Warmogs, along with boots 1.
Second, sorc boots and Leviathan (durn durn durrrn, I know everyone hates it, but hear me out).
Third, haunting guise followed by Amtas or Rylais. I was going Rylais first, but will go Atmas in future.
What this gives you, usually, is 3000+ health at lvl 12ish, and more than 4000 at 18 (4700 if you max leviathan’s stacks, I believe). You get leviathan because the 9-or-so stacks you need to beat the more expensive belt for health boost come easily, and if you do make it to 20, well that’s just gravy. Cheap health, on top of Warmogs and Rylais = a really powered Atmas (which provides a little AR by the way).
I haven’t seen the damage you start doing at 4000+ hitpoints, but that same build with Force Of Nature instead sees 18% crit and 260 damage, or something, which is great for face whacking.
Another reason for the health is that with the pet nurf pets can be quite soft (bonus of 15% of Morde’s health from 50%). This way, at 18, a pet Ryze has 3000 hp and, of course 75% of your AP and AD.
I know standard theory is to stack resists to 150 and 3000hp, and this will keep your shield alive longer, etc, but anyone playing Morde out there i suggest you try this approach. I have survived things I shouldn’t have and really only Bloodrazor is the counter (and you should be charging that carry and COTG them anyway). Having this much health means you live long enough to cycle Q, W and E three times or more while being picked on, rather than one or two, so in the end, more shield soaking and more damage.
Next goal is to get the huge HP, Atmas, and then Ghost a Trist. Her stats +75% of my AD and a bonus 15% health might put the ghost back into the threat it used to be on the field.
Anyway, some fun experimenting.