This is "Reaper," the Signature of the S-rank Cognitive Officer Faye Yun. Its ability is simple, yet more effective than most — the power to heal any wound she inflicts upon a person or object.
This isn't the way I would explain this unique ability, however. To put this into words, she reverts something she has damaged to its original state.
With the flick of her wrist, she lifted Silas off the blade. When Silas got on his feet, it was as if he wasn't struck by her at all. Nothing showed signs of the stab, from his skin to his clothes.
However, this was not what the two needed to focus on at the moment. The entity's lingering presence still shadowed them — like a predator hunting its prey.
Silas and Faye retreated to a well-lit street before standing back-to-back. Faye's Signature was used for healing, meaning it took an extraordinary wielder to make use of it in battle.
Under the assumption that the entity could not understand them, she whispered to Silas:
