Wondrous item, legendary
This idol looks like an ornately detailed miniature statue of a black cat wearing gleaming jewelry. When you attune to this idol, you gain wondrous catlike powers. You gain a climb speed of 40 feet, darkvision out to 60 feet (or 120 if you already possessed darkvision), and advantage on Dexterity checks and saving throws.
Curse. You cannot willingly be parted from this idol unless you are the subject of a remove curse spell. After every long rest, you must make a DC 10 Charisma saving throw. If you ever fail this saving throw, your soul is bound into the idol, and your body is inhabited by a cat spirit. The cat spirit sows mischief in your name, acting like a licentious criminal. Each midnight thereafter, you must make a DC 14 Charisma saving throw to return to your body.
Once you have returned, you are not subject to the idol’s curse for a month, after which the idol attempts to replace you with the same mischievous spirit, which seems to delight in ruining your life and reputation. When you fail your third such saving throw, you are instead permanently charmed to behave as the cat spirit does, and the idol can be transferred to a new victim.
5th Edition Horror. © 2018, Fat Goblin Games; Author: Ismael Alvarez