According to the Blox Fruits Wiki and player experiences, the Black Cape is an accessory in the game Blox Fruits that grants the user 5% more damage on any attack, 100 energy, and 100 health. It is considered a good item for beginners since it increases health, energy, and damage, but the boosts are small. The Black Cape can be obtained by reaching level 50 in the game and buying it for 25,000 Beli. It is not clear from the search results whether the Black Cape can stack with the Tomoe Ring, but the Tomoe Ring is a different accessory that increases the users sword damage by 10%.