Has some potential, but by itself isn't unique in any way. I could be interested, but you'll need something much more than that barebones description if you want to attract people.
How about this:
Imagine a world where demons and angels aren't just supernatural beings but entities deeply connected to
souls, karma, and contracts. In this world, every soul has a
karma score where good deeds generate positive karma, while evil acts create negative karma. Demons seek negative karma to grow stronger, while angels strive for purity. Souls can be
traded, consumed, or forged into powerful weapons and artifacts, making them the most valuable resource in existence. Some souls even contain both light and darkness, making them unpredictable and highly sought after.
Bloodlines play a crucial role in shaping a demon’s abilities—each demon is born with a mix of bloodline traits (fire, ice, shadow, etc.), and through rituals, they refine their essence, discarding weaker traits in favor of a dominant bloodline.
Demons interact with mortals and other beings through
demonic contracts, powerful pacts that grant wishes, bestow supernatural power, or even transform individuals into vampire-like creatures or werewolves in exchange for their souls. These contracts are nearly unbreakable, with dire consequences for those who betray them. Some demons go even further,
marking souls to create permanent servants, forcing their victims into unwavering loyalty. Advanced demons and angels also practice
soulcrafting, forging weapons and armor out of their own soul essence or the souls of powerful creatures. These soul-bound weapons can be recalled at will and even develop sentience. Evolution in this world is tied to collecting souls, with demons rising in rank from grotesque embryos to mighty
Abyssal Sovereigns, while angels ascend towards divine beings. This intricate system of power, soul manipulation, and karma defines the eternal struggle between demons, angels, and those caught in between.