Leviathan from Diablo! That is a really cool armor, I love it! Could definitely make it work. However, unfortunately it seems a bit weaker than Lionheart:
Lionheart475 Def
20% ED
25 Str
15 Dex
20 Vit
50 Life
30% All Res
Leviathan1623 Def
48 Str
23% Dr
Lionheart is effectively ~100 Str (25 (str) + 20 (ED) + 15 (dex) + 20 (vit) + 12.5 (50 life)), so that definitely beats +50 from Leviathan.
30% All Res is also slightly better than 23% Dr, since I already have 11% Dr from String of Ears and low resistances.
The only advantage is 1600 Defense, but that's not a big deal. Even socketing with 40%ED jewel wouldn't change the picture.
That's exactly the reason why runewords suck.. Even a simple Lionheart is so overpowered that it beats the rarest unique armors

It will be useful for Merc though, since they can't get Dr very easily. However, Shaft is probably better since it has higher Dr and +Life. Who balanced this game??

