Here is your basic build
RoR.builders - Witch Hunter
You run right tree because it gives your three most important tools
Burn away the lies: Main execution a dot damage with a burst at the end, always have it on your target
Pistol Whip: Main tool for killing, do a good damage and let you set kills for your group
Sanctified oil: Can be used as a offensive tool to refresh opener and to charge an enemy or as defensive tool to reach your healers
Fanatical Cleansed: Just more damage for your crits
Middle tree: We dont care about it
Left tree
we want blessed blades, but since you lack the renown to reach it take shroud of magnus and use it as a defensive tool against Rdps
For tactics:
Flowing accusation: Chance to get accusation points back so you can add more burst damage with absolution
Brute Force: More strength = more damage at least until you can cap it
Flanking: 15% more damages when striking from back or sides (you should always be there)
Fanatical Cleansed: Just more damage for your crits
Renown points:
Increase critical chance and reduce your chance to receive it, disrupt magic if you think that will work
Gameplay style:
-Use stealth before enemy notices you
-Focus a squishy target
-opener -> pistol whip-> Fervor -> torment-> BAL (if you get accusation back spam torment to get 5 points and use absolution)
-if the target isnt dead keep aplying BAL and pistol whip when the invulnerability buff runs out, remember to use fervor at least one time to shield BAL from being cleansed
-sanctified oil to run to your group if things get nasty
-If BAL is already on the enemy and you cant pistol whip him use torment to get 5 points and use absolution.
-If you are not facing a high priority target (a healer) always be sure to check the enemies around. focus the one who are already with low hp since your burst damage is amazing to secure kills also absolution is a range attack so before using it you should check again for any low hp enemy who is fleeing the battle and finish him unless you are sure that it is going to kill your current target.
-Repeat