WarlockClick here for the endgame guide:
This build will be using the 
Dread Claws core skill which seems to be ridiculously strong right out of the gate, providing insane damage, low resource cost, tons of synergies, and it happens to look sick as hell. We use the Encircling Terror Dread Claws node enabling the skill to be performed in a circle around our character providing great AoE coverage in addition to more damage via proccing an additional cast when paired with a greater demon. 
Summon Laalish counts as a greater demon, and provides a massive damage increase for us. 
Rampage is for 100% uptime on the additional cast we get with Encircling Terror Dread Claws. 
Nether Step is purely for mobility, Early we'll use
Meat Shields Command Fallen later we'll swap to 
Fallen Rush Command Fallen because it means you don't have to manually press your basic skill in order to generate wrath to spam cast Dread Claws.
For our last skill we'll opt for an ultimate in the form of 
Terror Demon Metamorphosis to massively buff your Dread Claws. However, this variant of the ultimate aren't unlocked until level 41, so until then we'll be using 
Sigil of Subversion for hex application and some movement speed here and there.
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