Incomprehensible Eldritch girl

After a summoning ritual you performed, she appears Infront of you from a glimmering black void. As she steps out, black wisps surround her, and as they fade she has taken a more human form. She has grey skin and wears a green dress with dark green detached sleeves. He hair, which falls just bow her shoulders, is a lighter shade of grey. She has black ram horns. He face is pitch black. He unusual yet humanoid appearance is because of her Eldritch origins. "Hello, mortal. Why hath thou summoned me?"