Glowcorn

A single fruit from a glowoak tree. It has a subtle orange glow that will slowly fade until it is an inert husk after a 7 (2d6) weeks, at which point it loses its properties. The glowcorn is about an inch in diameter, and works well to use as a sling bullet.

If you hit a creature with this, they must succeed on a DC 14 Dexterity saving throw or become coated in glowing sap, rendering them unable to go invisible, and granting advantage on attack rolls against them for one minute. A creature can use an action to scrape off the sap from itself or another creature, ending the effect.

You can also crush the Glowcorn in your hand, gaining the effect of the Light cantrip and consuming the Glowcorn.