Spider Bite

Weapon (Dagger), Very Rare, (Requires Attunement)

When you hit a creature with an attack made with Spider's Bite, the target must make a Constitution Saving Throw, (DC = 8 + Dexterity Mod + Proficiency Mod). On a failed save, the target becomes diseased for 1 minute. Roll a d20 and apply the respective effect.

At the end of the target's turns, it can make a Constitution Saving Throw to end the Diseased Condition. If the target fails the Saving Throw by 5 or more, it automatically fails it's next Saving Throw.