They- they chose her. Agrid sat up in her seat and leaned forward, her blazing eyes locking on Puriel and their little minion for a moment before a large grin split her face in two. She cackled like an old hag as slithered out of the chair and laid down on the ground next to them. The vial appeared out of a puff of shadows and smoke once more. She snatched it out of the air, her grin contorting into a demented smile. 

“This is more than just a healing potion, Puriel. It's hellfire, straight from the pits themselves. It'll do more than just heal you, darlin. It'll empower you but I only have the one. So you should be thankful that I'm willing to give it over to you for your service.” She stood swiftly before she uncorked the vial. The room grew dark as if all the light had been sucked into the fire. Once opened, the flame inside began to grow until it licked its fiery tongues outside of its lid. Agrid reached down and grasped a hold of the flames and it consumed her shadows and dark smoke, turning the flames black as night. The cries of the damned called out from the flames and if you were to look close enough, one could even see small faces of souls as they screamed in the fire. 

It continued to consume all light in the room and Agrid's dark magic until there was no light left, the black flame being the only thing producing any light in the whole apartment. Agrid ripped her hand out and it sizzled and smoked. She gave it a shake with a hiss before she crouched down in front of Puriel. 

“Prepare yourself fallen.” 

She then laid the fire down on their back where it crackled and danced for a moment. With a wave of her hand, the fire began to grow, consuming all of Puriel within its grasp. Every part of them was covered in the black fire now and they glowed like a demonic night light. Agrid backpedaled a few steps, still remaining crouched all the while, her eyes locked on Puriel as she watched the flames hungrily. Oh how she wished she could be the one using those dark flames but she had made a deal, and much like the new demon had said, the Devil's in the details. 

Eventually the fire faded and Puriel's body was completely healed. Agrid stood and walked over, examining them like someone looking to purchase a new car. She checked the old wound locations before giving a firm nod. 

“How do you feel?”