The sling pellet gleams with a sickly verdant patina, its leaden surface etched in swirling veins of acidic residue that fizz and pop like trapped insects. Tiny bubbles erupt across its dimpled skin, dissolving faint wisps of vapor that carry a sharp, metallic tang. When loosed, it arcs through the air trailing a hazy green mist, burrowing into flesh or stone with a wet sizzle that eats away in relentless, bubbling decay.