Deep in the Underdark grow glowing plants that shed limited light into a realm shrouded forever in darkness.
In the case of Spore Trees, they not only glow, but lure unsuspecting creatures to their doom.
clouds of spores surround the roots of the plant, and any creature that breathes them in will fall into a deep sleep. making them easy prey for wandering monsters, or the plant itself.
Collect them all.