Soldier + Oathbreaker = Warlord
Demolitionist + Oathbreaker = Paladin
Nightblade + Oathbreaker = Oppressor
Occultist + Oathbreaker = Sentinel
Arcanist + Oathbreaker = Shieldbreaker
Shaman + Oathbreaker = Templar
Inquisitor + Oathbreaker = Archon
Necromancer + Oathbreaker = Dervish
Well, there’s a lot of assuming going on, not all of it correct. It’s the nature of the guessing game. 
Soldier + Oathbreaker = Warlord
Demolitionist + Oathbreaker = Archon
Nightblade + Oathbreaker = Oppressor
Occultist + Oathbreaker = Sentinel
Arcanist + Oathbreaker = Shieldbreaker
Shaman + Oathbreaker = Templar
Inquisitor + Oathbreaker = Paladin
Necromancer + Oathbreaker = Dervish
Updating after Zantai’s reveal
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Paladin
Oathkeeper + Nightblade = Shieldbreaker
Oathkeeper + Arcanist = Archon
Oathkeeper + Occultist = Sentinel
Oathkeeper + Shaman = Dervish
Oathkeeper + Inquisitor = Templar
Oathkeeper + Necromancer = Oppressor
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Archon
Oathkeeper + Nightblade = Shieldbreaker
Oathkeeper + Arcanist = Sentinel
Oathkeeper + Occultist = Oppressor
Oathkeeper + Shaman = Templar
Oathkeeper + Inquisitor = Paladin
Oathkeeper + Necromancer = Dervish
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Templar
Oathkeeper + Nightblade = Shieldbreaker
Oathkeeper + Arcanist = Archon
Oathkeeper + Occultist = Opressor
Oathkeeper + Shaman = Paladin
Oathkeeper + Inquisitor = Sentinel
Oathkeeper + Necromancer = Dervish
Omg Warlord is not Shaman?! NOOOO 
Oathkeeper+Soldier = Warlord
Oathkeeper+Demolitionist = Archon
Oathkeeper+Arcanist = Paladin
Oathkeeper+Occultist = Dervish
Oathkeeper+Nightblade = Shieldbreaker
Oathkeeper+Shaman = Sentinel
Oathkeeper+Inquisitor = Templar
Oathkeeper+Necromancer = Oppressor
Second try
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Shieldbreaker
Oathkeeper + Nightblade = Sentinel
Oathkeeper + Arcanist = Archon
Oathkeeper + Occultist = Oppressor
Oathkeeper + Shaman = Dervish
Oathkeeper + Inquisitor = Paladin
Oathkeeper + Necromancer = Templar
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Templar
Oathkeeper + Nightblade = Dervish
Oathkeeper + Arcanist = Archon
Oathkeeper + Occultist = Sentinel
Oathkeeper + Shaman = Shieldbreaker
Oathkeeper + Inquisitor = Paladin
Oathkeeper + Necromancer = Oppressor
Or
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Templar
Oathkeeper + Nightblade = Shieldbreaker
Oathkeeper + Arcanist = Archon
Oathkeeper + Occultist = Sentinel
Oathkeeper + Shaman = Dervish
Oathkeeper + Inquisitor = Paladin
Oathkeeper + Necromancer = Oppressor
or
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Templar
Oathkeeper + Nightblade = Shieldbreaker
Oathkeeper + Arcanist = Paladin
Oathkeeper + Occultist = Sentinel
Oathkeeper + Shaman = Dervish
Oathkeeper + Inquisitor = Archon
Oathkeeper + Necromancer = Oppressor
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Archon
Oathkeeper + Nightblade = Shieldbreaker
Oathkeeper + Arcanist = Templar
Oathkeeper + Occultist = Oppressor
Oathkeeper + Shaman = Sentinel
Oathkeeper + Inquisitor = Paladin
Oathkeeper + Necromancer = Dervish
Then let’s try again!
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Archon
Oathkeeper + Nightblade = Dervish
Oathkeeper + Arcanist = Templar
Oathkeeper + Occultist = Sentinel
Oathkeeper + Shaman = Shieldbreaker
Oathkeeper + Inquisitor = Paladin
Oathkeeper + Necromancer = Oppressor
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Shield Breaker
Oathkeeper + Nightblade = Dervish
Oathkeeper + Arcanist = Archon
Oathkeeper + Occultist = Sentinel
Oathkeeper + Shaman = Paladin
Oathkeeper + Inquisitor = Opresssor
Oathkeeper + Necromancer = Templar
Templar, Shieldbreaker, Paladin, Dervish, Archon
Attempt #2
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Archon
Oathkeeper + Nightblade = Dervish
Oathkeeper + Arcanist = Paladin
Oathkeeper + Occultist = Sentinel
Oathkeeper + Shaman = Templar
Oathkeeper + Inquisitor = Shieldbreaker
Oathkeeper + Necromancer = Oppressor
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Archon
Oathkeeper + Nightblade = Dervish
Oathkeeper + Arcanist = Shieldbreaker
Oathkeeper + Occultist = Sentinel
Oathkeeper + Shaman = Templar
Oathkeeper + Inquisitor = Paladin
Oathkeeper + Necromancer = Oppressor
Here’s my guess.
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Shieldbreaker
Oathkeeper + Nightblade = Dervish
Oathkeeper + Arcanist = Paladin
Oathkeeper + Occultist = Oppressor
Oathkeeper + Shaman = Archon
Oathkeeper + Inquisitor = Templar
Oathkeeper + Necromancer = Sentinel
Here is a great hint for you guys.
What is a spell breaker? Now what is a shield breaker?
whatever: :rolleyes:
Oathkeeper + Soldier = Warlord
Oathkeeper + Arcanist = Archon
Oathkeeper + Nightblade = Shieldbreaker
Oathkeeper + Demolitionist = Paladin
Oathkeeper + Occultist = Sentinel
Oathkeeper + Necromancer = Opressor
Oathkeeper + Inquisitor = Templar
Oathkeeper + Shaman = Dervish
edit I have a feeling dervish and sentinel are wrong… and should be exchanged
Initially, I thought Shieldbreaker would be Arcanist or Nightblade due to the similar class name but I’m almost certain that it’s Demolitionist now.
If you ask Spellbreaker Moira in-game what a Spellbreaker is, she replies:
We are Legion-sanctioned arcanists specialized in disrupting enemy spellcasters. Our primary duty is the nullification and elimination of enemy arcane capabilities.
A Spellbreaker is exactly that - a breaker of spells. Now, what is a Demolitionist? Well, the text for them has this to say:
In the times of the human empire, demolitionists would be called upon to break enemy ranks and to breach fortifications using a clever mix of engineering and sorcery.
Attempt #3
Oathkeeper + Soldier = Warlord
Oathkeeper + Demolitionist = Shieldbreaker
Oathkeeper + Nightblade = Dervish
Oathkeeper + Arcanist = Archon
Oathkeeper + Occultist = Sentinel
Oathkeeper + Shaman = Templar
Oathkeeper + Inquisitor = Paladin
Oathkeeper + Necromancer = Oppressor