Cantamarion

Cantamarion is a dragon that was formerly a snake. Now given sapience and immense fae magical power, she is cantankerous and solitary. Her lair is in a cavern, and has slowly been converted into a strange place based on her dreams and her preferred aesthetic of geometric, grayscale forms...

She is not safe to approach. The lance sticking through her body was a holy dragon-slaying lance that failed to kill her because it missed her heart.

Formerly a Goodbye Strangers character, not anymore because ouch :(