Hello dudes!!!
I looking for the Covenant of the Three to my Conjurer caster build…
Where the best place to find it? … somebody have it and wanna trade?
Blueprint is dropped by the Sentinel.
Oh man!!! that guy? is super annoying to figth with him… thank you, I haven´t another way 
Are you shure this guy drop this one blueprint?
Because I’m been running him and drop the other one blueprint:
He drops both.
Try farming the Crucible. It has chances to drop the BP as well
The Sentinel is insane Op for some character… but I gonna keep trying.
Are you trying to fight it while he’s near one of the green crystals he summons? Lure him away from the green crystal.