Ill Omen
Weapon (longsword), uncommon (requires attunement)
You have a +1 bonus to attack and damage rolls made with this magic weapon while in moonlight.
When a creature that you can see within 60 feet of you makes an attack roll, an ability check, or a saving throw, you can use your reaction to roll a d20, and then choose whether the creature uses its roll or yours. Once this property has been used, it cannot be used again until you score a critical hit or reduce a creature to 0 hit points with this sword.
Curse. If you use this sword to increase the roll of a creature rather than lower it, you accrue one point of bad luck. When you make an attack roll, an ability check, or a saving throw, the GM can spend one point of bad luck to roll a d20, and then choose which roll you use.
Forged under a blood moon, with a crimson moonstone set in the pommel, this longsword carries an ominous aura about it. Be careful wielding this blade if you wish anything but ill upon those around you.