>>538153142
Give him these two items.
Generally build around the idea of maxing out veil degredation with aoe attacks then spamming psyker powers to trigger psychic phenomena which permanently increase his psy rating.
Each psy rating dramatically increases the damage potential of this force sword. There's technically an upgraded version of this sword in act 3 so you could dual wield them or opt to use a shield.
I used these this combo to deal 10k damage to Epitaph in a single hit so it's pretty good.
