Originally Posted by
keymil
I'll repeat my theory about these.
Third picture is the Jailer.
First and second picture is not the Jailer. It's the creature that is imprisoned within the Maw.
That creature is the Father of Pantheon. He doesn't have to be a Titan himself, but he's the being who created the current Titans / Titan Souls. He was corrupted by the void or some other powerful force and the Pantheon, unable to destroy him, decided to imprison him in the Maw within the Shadowlands - the most secure place in existence. The Arbiter agreed to that and tasked the Jailer, who was already watching over the spirits within the Maw, with eternal vigil over the Fallen Father. Throughout the time, the Jailer was being slowly corrupted, until the Fallen Father swayed him over to his side and they started scheming to release him.