having a seraph mother ( an angel near the top of the divine hierarchy ) and a demon prince father ( a demon who commands primordial hellfire ), makes seraphina incredibly powerful. mixing grace with demonic blood creates a high output power set that constantly wants to tear itself - and the environment - apart. the following are powers that sera has, though may or may not use often, depending on where they are, what wardings are around him, and if they're being tracked.
corrupted grace. unlike normal angels who burn out without grace, sera's grace is fueled and mutated by her demonic blood, making it harder to drain. she also cannot be easily killed by standard angel blades, nor can she be exorcised by standard latin rites.
true form. when sera taps into their full power, her true form casts an imposing figure: six wings made of blinding white light, though looking closer, the wings are tarnished and filled with tatters and holes. looking directly at him in this form can blind mortals and burn lower level demons to ash. even angels have gone mad seeing their true form.
superhuman physiology. sera possesses vast physical strength, near invulnerability to any weapons ( besides high heaven weaponry ), and incredibly advanced healing ( of themselves and others ).
smite. white hot holy light emitted from her hands or eyes, capable of incinerating standard demons, monsters, and reapers, as well as lower level angels.
hellfire and biokinesis. red flames that consume physical matter and wards. sera can cause internal bleeding, organ failure, and blood boiling in targets with a snap of their fingers.
combustive telekinesis. beyond moving objects without touching them, she can also crash cars, blow off building walls, pin powerful entities to walls, and also cause demons, mortals, and lower angels to implode.
soul and grace perception. sera can naturally see the state of a person's soul, an angel's grace, or a demon's pacts. she can instantly tell if someone is possessed, cursed, alive, dead, or lying about their supernatural nature.
teleportation / flying. while full scale spatial folding ( aka using her wings to fly ) is erratic due to her mutated grace and tainted wings, they can still perform short range combat teleports, appearing in a flash and disappearing the next moment to a safe location within 10 miles.
localized warding invalidation. because sera carries the frequencies of both heaven and hell, basic enochian anti angel wards and devil's traps only half work on them. he can force his way through magical barriers that would trap other angels or demons, though doing so causes extreme physical strain.
grace instability. emotional trauma, extreme exhaustion, or overusing her power causes angelic and demonic energies to clash inside of their body. this is apparent on their skin with black veins, as well as dark blood exiting from their eyes, nose, and ears. erratic power bursts alert both heaven and hell to his location, so sera tries to keep this from happening often.
bonus, how to kill sera: you'd have to drain them of most of their grace, first ( you will never be able to drain it all, you'll just have to get out as much as possible ). then, once weakened, some sort of biblical weapon must be used. an archangel blade, michael's lance, cain's first blade. it will take more than one strike, and you better hope she's secure before you try.