Maeve/Raposa - Character Design

My character, Maeve that I created for a friend’s RPG based on Genshin.

Raposa (Code name) is a shadow agent serving under the jurisdiction of the Fatuis, she is currently Dante’s right-hand man, performing all the arduous tasks asking to get his hands dirty.
She was raised and trained by the Fatuis from an early age and does not seem to remember any events of her past except since she joined the Fatuis.

Her hands are the result of an experiment conducted on young orphaned children aiming to master the abyssal energy, the mark on her back is currently a seal that retains this uncontrollable abyssal energy, what could happen if it were to break ?