Fix their Aura of Hate to only affect allies and to work un unarmed undead summons, it's pretty stupid that your oathbreaker aura becomes a liability in Acts 2 and Act 3 because it only buffs you, since undead are unarmed and don't count so your summons don't benefit, and your aura ends up buffing all the undead enemies as well as devil opponents in the later acts.
Oathbreaker should also have their smite option be ncrotic damage and have a passive that removes necrotic damage resistance or halves its effectiveness.
Oathbreaker Paladin is the closes thing to a Death Knight one gets, but since summons in this game outside myrmidons and dryads are really bad, and so much of the game has necrotic resistance, necromancers and oathbreaker are really gimped compared to vengeance paladin and other casters.
