Your hammer is a blur.
Your armour is heavy.
Your sanctuary is infinite.
A build without Spiral, Clemency or Guidance? Who would've thought it possible?
Shadow Walk: Dusk can be replaced with your preference. It's good damage but things like protection or voracity can help in the early game. In the late game, Quicksilver is pretty fun too.
Frostbite: Run Confidence until you find Divine Faith. Run essence of Frost until your damage needs a boost or you're feeling healthy enough. It can be replaced with Glaciation, Void or Sharpness. Going for Fever+Sulfur/Scorch also works if you love explosions and hate seeing the ground.
Sanctuary: Flow is necessary until you're VERY deep into the run. Shatter and Pure White aren't. It's a cool combo but the effect of Flow is wasted on 10 second cooldown Empowered essences in this case. Sanctuary has a 10 second duration and cannot be overlapped.
Umbral: Insight is pretty bad but I wanted to make use of it in a build. Also, it has SOME synergy with Flow. It can be replaced with metal/efficiency/paranoia.
WARNING:
Avoid Essence of Flexibility. It'll kill you immediately.
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This build doesn't "insta-kill" stuff like many of the others. It is however outragesously fun to face-tank everything with infinite Ulti's, and a hammer that sounds like a Phalanx CIWS.
It's plenty strong enough on its own and also helps out in co-op with armour, shield and attack speed buffs.