Ruinbound

The Ruinbound are mutants that can be born to any humanoid species that has contact with the Daelkyr or their minions. A Ruinbound is born with a personal symbiont—an unnatural entity bound to the child. Unlike most symbionts, this entity cannot be separated from its host, and the two are permanently fused. Many Ruinbound have additional disturbing mutations; you can roll on the Ruinbound Mutations table for ideas, or create your own. These secondary mutations are disturbing, but they don't change the rules of how that character is played or grant mechanical benefits. For example, even if a Ruinbound seems to have no eyes, their vision uncannily works as well as any other member of their species, though it defies logic.
Aside from their mutations, Ruinbound share the appearance of their parent species. The Mror Holds have seen a surge of Ruinbound births since the War Below began, and there have always been Ruinbound orcs and humans in the Shadow Marches. Even in these places, however, the Ruinbound are rare and remarkable, and generally don't pass their traits on to their offspring.
When making a Ruinbound character, work with your DM to determine the appearance of your Personal Symbiont. It is organic and clearly alien, and when you cast a cantrip with this trait, it should be obvious that the symbiont is the source. A symbiont that casts Mage Hand could be a thin tentacle or an ectoplasmic insect that emerges from your body and performs the action. An eyestalk protruding from your shoulder could grant you Guidance as it studies the situation and telepathically advises you—or it might blast your enemies with a Mind Sliver.