Hey everyone (well everyone who reads this)!

I'm working on a character concept that I'm really excited about & wanted to get the community's take on the mechanics behind it...

Her name is Eris Grimthorne, a Glasya Tiefling born to a Night Hag mother who struck a pact with Glasya herself. In the womb, Eris had a twin who sacrificed their own soul so that Eris could survive. That lost twin's soul now lingers within Eris & manifests as a sentient weapon, revealing themself when she’s in danger/combat. I was thinking the twin could be acting as her Hexblade "patron."

Now, here's where I need some input:

I’m building her as a Hexblade Warlock, with the twin’s soul as the "patron"(?), but I’m also leaning toward multiclassing into Aberrant Mind Sorcerer—not just for mechanics, but because it feels like a natural fit. I was thinking her psionic powers would be the result of being born of a Night Hag, whose very essence twisted her development even before birth.

Does this combination (Warlock/Sorcerer) make sense both narratively and mechanically?
Could the twin's soul empower her as a Hexblade while her aberrant sorcery comes from her hag bloodline?

I’m less worried about raw optimization & more about whether this story, as well as multiclass, makes sense within 5e rules & flavor. Can the twin's lingering soul act as her Hexblade patron? Can her Hag bloodline contribute to her Abberant Mind abilities? Has anyone done something similar?

In my mind it makes sense...

I'd love to hear your thoughts—especially if you’ve played or DMed for a Warlock/Sorcerer multiclass, or if you have lore-based feedback, I'd greatly appreciate it.

Thanks in advance!

—Kyle (and Eris)

Narratively, I'd say no. The twin had no power, so how could they act as a patron? The patron lends their power to the warlock, thus they must be an extremely powerful being. Plus a Hexblade's weapon is not in anyway "psychic", a psychic blade could be mimicked with the Shdowblade spell or with soulknife rogue. Beyond that, the soul of a twin manifesting as a weapon feels weird and dehumanizing of that twin. 

Narratively, a twin sacrificing themselves so the other could survive would be that twin making a pact with a higher being that involves the other twin, so could work as a warlock origin story whereby the surviving twin has been thrust into the pact against their will by the choice of their twin. You could then choose what kind of being that twin made the deal with, it could be a god (celestial warlock) or a devil (fiend warlock) or something else. If you want to be a Hexblade then narratively/lore-wise that would be the twin making the deal with the Raven Queen. The Raven Queen would be your character's patron, not the twin. However, since the Raven Queen is also involved with memories, you could discuss with the DM having the Raven Queen communicate with your character via dreams of their twin and the RQ adopting the image of the twin. 

You could maybe have the twin being turned into a weapon as a punishment by the patron, e.g. the Raven Queen might strike a deal such that, she will save your character on the condition that your character's twin ensures that your character becomes a warrior for the Raven Queen, and thus the RQ turns the soul of the twin into a hex weapon to ensure they keep their end of the deal. 

If the twin sacrificed themselves to a Fiend patron instead, then it could make sense for the twin to have been turned into an Imp in Hell and sent back to the PC as a familiar as a threat by the Fiend patron that if your character does not do as the Fiend demands their twin will be sent back to Hell to suffer for all eternity.

Thank you for the feedback! I appreciate the thought put into your response. I agree that by the default lore, a patron must be a powerful, external entity. I guess I’m aiming for a more symbolic & psychological interpretation of the Warlock pact.

Eris was born to a Night Hag mother who struck a pact with Glasya herself, & her twin soul was absorbed in the womb to ensure her survival. The concept I’m exploring is that the “patron” isn’t the twin alone, but the manifested will of that sacrificed soul—possibly shaped & empowered by the lingering influence of Glasya or the latent magic of the hag bloodline. The Hexblade pact is less about receiving gifts from a distant being & more about this internalized, sentient remnant—a twin's soul that has fused with Eris' psyche & manifests to to aid/protect her when she's in danger/combat.

You’re right that a Hexblade weapon isn’t explicitly psychic in RAW, but flavor-wise, I’m treating the pact weapon as a projection of Eris’ inner power and trauma. Mechanically it's a Hexblade, but thematically it's a psionic echo of her twin—a sentient shard of soul that grants warlock powers by being the channel for something deeper, like a psychic wound or shared fate. That’s why I paired it with Aberrant Mind—her powers aren't from a traditional outside source but a lingering aberration of birth & pact magic twisted by emotion & legacy.

Rather than dehumanizing the twin, I’m aiming to honor that soul by making it central to Eris’ identity. The blade is not a punishment, but a bond—equal parts power source, voice of reason, & a painful reminder of the price she didn't choose to pay. If anything, Eris’ whole arc is built around reconciling the gift and grief of that bond.

And of course, I’d work closely with my DM to make sure it fits the tone of the world. But D&D is full of warlocks with unconventional patrons—sentient weapons, alien minds, even the unknowable void. If a magic sword can be a patron, I think a twin soul—empowered by infernal legacy & narrative weight—can be just as compelling.

Ok... To put it tactfully, you are assuming a real-world view that many people do not agree with, and that many people have very strong opinions on. You will need to make sure not just your DM but every player at your table is ok with it. There's probably tables out there who would be fine with it, but it wouldn't be either of the tables I play at.