Giant Tortoiseshell Fury

A gigantic tortoiseshell cat spirit, with a mystical glow, slips into your home, drawn in by the warmth of a sunbeam across your windowsill. When you return, you find the colossal feline basking in the golden light, muscles rippling with each purr. Attempting to interact, you reach out to touch it, only to have it leap to its feet, playfully baring its teeth in a show of faux ferocity.