Father Ariandel

Father Ariandel is an NPC and partial boss in Ashes of Ariandel dlc of Dark Souls III.

Location
He's located in the Painted World of Ariandel in the Ariandel Chapel bonfire area, he can be accessed by turning a wheel in the insect pit underneath the Chapel, which will activate a contraption revealing the passage near Elfriede where he's held.

Description
Father Ariandel is a giant deformed monstrosity, covered in feathers, with long black hair and a decayed face. His head is disproportionately small by comparison to his body, and his limbs are long and thin.

He's bound and tied to a chair where he sinks his head inside a large Lordvessel-like bowl which he uses as a weapon.