I have tried following Bleakwalker multis in the current Beta:
- Bleakwalker/Devoted
- Bleakwalker/Shattered Pillar
- Bleakwalker/Berserker
The most fun I had with a Bleakwalker/Devoted mountain dwarf dualwielding battle axes. With Confident Aim/Disciplined Strikes/Sworn Enemy your Flames of Devotion almost always crits and basically oneshots everything. He was also very sturdy thanks to Constant Recovery and the Stances/Auras/Passives of both classes. The only downside is, that your weapon selection is very limited.
Next was a fist fighting Bleakwalker/Shattered Pillar nature godlike. She was definitly the fastest attacker, but her hits with Flames of Devotion were not as hard as from the previous competitor (monk has less crits and less crit damage). Torments reach should be spamable by using the Shattered Pillars wound generation, but unfortunately it is no longer a full attack.
With the Bleakwalker/Berserker (again a mountain dwarf dualwielding battle axes) I had the least fun. He was just too squishy for me. Frenzy gives great bonuses, but even if you can later eliminate the confused affliction it still gives a deflection malus, self damage and hides your health bar. The good thing is that with Barbaric Blow he has an additional full attack ability, which also has an upgrade for refunding the ressource cost on kill. He also gets many cool passives.
When the game is released I think i will stick to the Bleakwalker/Devoted multi class. For me it's the best balance between offense and defense.