[1.1.8.1] Physical Retaliation Warlord (3 builds, EoR included) -> Crucible 4:30-4:55/ SR 105-110/ Ravager 0:48-1:12 + Callagadra 0:54-1:33 + Crate boss facetank/ 75-76 farmer / Bonus SR 135 video with tank setup

I would go with classic way: 2h forcewave.

The reason is that retaliations are most gear demanding builds that works great basically only after you reached end-game and invested into them a lot. However it should be possible to level with physical retaliation itself - with full Perdition set (since level 40) + Ugdenbog Girdle (since level 40, highest acid->phys conversion recommended). I read some players opinions that it’s comfortable but I don’t know any guide with step-by-step to do that.

So:

  1. If you are beginner go with guide linked above.
  2. If you are more experienced and got some gear already then you can always make an attempt to level with retaliation and eventually switch into forcewave if it fails.