Eberron Sorcerer
In a world where dragonmarked dynasties dominate the mystical economy, it’s easy to imagine how sorcerous bloodlines can fit into the world, but not every sorcerer has dragon’s blood or some inherited power. What defines the sorcerer is the fact that their magic comes from within, that they must exert their will to coax the powers that lay dormant within them to manifest. There are different ways that this can be expressed within a story, from the traditional sorcerous heir, to a vessel of the Mourning, or the product of Vadalis magebreeding. Morgrave Miscellany, page 69, gives examples of what playing a Rogue in Eberron might look like.
In addition to the subclass options presented on dndbeyond, the following Sorcerous Origins are also available:
Alchemical Savant
Whether through an event the befell an ancestor, orexposure to magical potions or treatments in your own life, or a particularly potent dragonmark, your body is infused with the transmutative power of alchemy. This spark of alchemical magic within within you persists as a lightning-like energy that grants you magical powers. While other alchemists and wizards strive to create the transformative talismans called transmuter's stones, you are a living transmuter's stone.
- Source: Eberron Archetypes, page 42