Rotted Needle - D&D5e (Patreon)

Wondrous Item, Legendary (requires attunement by a spellcaster)

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Forged from the imposing scale of a Green Dragon, this claw-shaped ring boasts a lethal allure. The tip of the claw is meticulously sharpened, and upon donning the ring, the claws gracefully arch over the fingertip, bestowing upon the wearer the essence of the Green Dragon's potent virulence.

As an action, you can make a melee spell attack against a creature within your reach. If successful, the target suffers 3d10 poison damage.

Touch of Death. Once per day, after successfully dealing damage with this item, you can use a reaction to release a drop of potent venom from within the Green Dragon’s scale. If the target has 100 hit points or fewer, it dies instantaneously as the venom permeates every fiber of its being. The victim's skin darkens to a deep shade of green in mere moments, accompanied by the emergence of a repugnant, rotting odor that fills the air. Simultaneously, the veins become grotesquely pronounced, turning dark, necrotic green as life is viciously drained from the body, decaying at an unnaturally accelerated rate and leaving behind a ghastly testament to the venom's devastating potency.