Ring of Darkness (3.5e Equipment)
From D&D Wiki
Ring of Darkness: This ring grants the wearer the ability to cast a 10-foot globe of shadow as though they possess a lesser version of the spell Darkness, allowing the user to cast it per spells known per day.
Weak Enchantment;CL 3rd; Forge Ring, Darkness; Cost 1,000gp + 40exp 2 days; Weight: - lb.; Market Price: 3,000gp