Curse of the Betrayed Queen. Whenever you roll a critical hit with Yohua on a creature under the effects of your Hexblade Curse, you can force it to make a DC 14 Constitution saving throw. If the saving throw fails by 5 or more, the creature is instantly petrified. Otherwise, a creature that fails the save begins to turn to stone and is restrained. The restrained creature must repeat the saving throw at the end of its next turn, becoming petrified on a failure or ending the effect on a success. A creature petrified in this way turns to obsidian rather than stone, and turns back to its original form at the end of their next turn.

If the cursed creature's hit points reach 0 as a result of a critical hit, they are immediately petrified, turning into obsidian and crumbling into a shimmering black dust. 

Sentience

Yohua is a sentient chaotic neutral weapon with an Intelligence of 17, a Wisdom of 10, and a Charisma of 19. It has hearing and darkvision out to a range of 120 feet.

The weapon can speak, read, and understand Common, and can communicate with its wielder telepathically. Its voice is deep and feminine. While you are attuned to it, Yohua also understands every language you know.

Personality

Yohua speaks with an erratic tone, it's unpredictable and likes to change its plans on a whim. It's used to have others put up with it, knows full well that its wielder can't interject and takes any possible chance to abuse its power when it can, though usually at no serious detriment to its wielder.

Yohua’s purpose is to be liberated from its prison, in the lost city of Omu.

A yklwa (pronounced YICK-ul-wah) is a simple melee weapon that is the traditional weapon of Chultan warriors. A yklwa consists of a 3-foot wooden shaft with a steel or stone blade up to 18 inches long. It costs 1 gp, and it deals 1d8 piercing damage on a hit. Although it has the thrown weapon property, the yklwa is not well balanced for throwing (range 10/30 ft.).

Notes: Petrified, Hexblade Warlock, Combat, Sentient, Thrown