Rokurokubi Whip

Weapon (whip), very rare (requires attunement)

This +1 whip is made of braided silk rather than leather. The whip critically hits on a roll of an 19 or 20. It has a range of 15 feet rather than the average 10 feet. Three times per day as a bonus action, you can transform the tip of the whip into a howling, fanged female humanoid head, increasing the weapon’s base damage to 2d6 and the target must succeed on a DC 16 Charisma saving throw or have disadvantage on all Charisma checks and saving throws for 1 minute. A creature that fails a second saving throw against this effect while already affected by it is afflicted with a curse which constricts their throat, making it harder for them to speak and breathe. A creature affected with this curse has a 20% chance of failing to cast any spell with verbal components.

Epic Attunement. You may wrap the rokurokubi whip around your neck as a bonus action, transforming it into a simple silken scarf. Your need for sleep is greatly reduced, and you can complete a long rest in 2 hours. You also gain immunity to magical sleep effects and gain advantage on Charisma saving throws. In addition, you can as an action, transform your head into that of a hideous abomination, granting you a melee natural weapon bite attack that deals 2d6 damage. While you are transformed like this, your natural reach for the bite attack is 15 feet and your body becomes supernaturally tough, granting you resistance to nonmagical bludgeoning, piercing, and slashing damage. You transform back at the beginning of your next turn. Once you have used this ability three times, you must complete a long rest before the charges reset.