Thanks! Got the final enhanced form, and this one is quite a doozy of an explanation.
Halphas was displeased with the rising animosity that Gretchen and Lilith had for Macabre and his family. Hell had little worth feeling compassion for, but Halphas always held that familial lines should never be considered a target as mortals with aspirations of power often do.
One day, an all-out skirmish erupted, led by Gretchen and Lilith, dragging Halphas along to face off against Macabre, Mirage, and Oliver. Even with early gains against them, with Oliver faltering against Lilith and Macabre entering a stalemate with Gretchen, Halphas instead chose to talk to Mirage about how he felt with the situation. Mirage saw that Halphas truly wanted something better, and offered him a chance to defect. Halphas refused, stating that Heaven would never allow such a high-ranking demon of the Goetia among them. However, he lent his prized sword to Mirage, in order to even the odds against the other two.
Despite this, the tide turned on its own; Ollie Awoke to his true power, and Macabre demonstrated his power over Hellfire, with the newly armed Mirage making the battle much easier, Gretchen, Lilith, and Halphas returned to their province in defeat.
Mirage’s offer continued to stay in Halphas’ mind, until he finally made a decision, and opted to try to convince his wife and daughter to turn a new leaf, one truly worth living for. He told them that perhaps even a lowly position in Heaven would be preferable to ruling in Hell, as they would truly be able to feel Joy. No more power struggles, no more reason to fight a needless battle. Gretchen seemed moved by his words.
Followed by her attacking Halphas and labeling him a traitor.
She had no desire to give everything up, as to her, what truly mattered was power, and she had no intention of giving any of it up to look after Heaven’s “precious mortals.”
While Gretchen and Lilith were strong, Halphas was the much more experienced fighter. Their battle was seen by all of their subjects, in shock at seeing the esteemed Goetia family fighting amongst themselves. As the battle raged, Halphas’ Blade of the Morning Star began to shine, and it’s light enveloped him, soon revealing a new form. Before anything else happened, a portal opened, with a voice calling out to him. Halphas didn’t hesitate, and used the portal to leave Hell, hearing the roar of fury from Gretchen as it closed.
Once Halphas got to the other side, his shape returned to normal, and he found himself in front of Mirage and Cerberus. Once again offering her hand, Halphas took her offer, and Cerberus opened the way to Heaven for him.
Halphas may have been a demon of the Goetia and a poor father to his son, but now he had a chance to begin anew, with the visage of the Seraphs as a sign to his new loyalty.

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So yeah, we finally have Seraph Halphas, something I figured for a long time was the logical conclusion to his character. Side note, despite the title, he’s not actually a Seraph angel, rather it was coined by others in reference to the fact that he looked like he had six wings, the two on his face and two on his back with his regular two wings.