Baals black band

Ring, artifact (requires attunement by a spellcaster)

When the Witch of Cania wed the devil Baal, she presented him with a black ring as a symbol of their union. The ring was of an ebony & cold iron alloy that bore an unusual wrapped pattern and chilled the skin with the cold of Cania. Truly, the only things in all of Baator more fiendishly dazzling were possessed by Asmodeus himself. The seldom left Baal's finger, it was his prized possession treasured high above all other gifts and treasures in his possession. In his private time, he began to tinker with his prize, pouring his infernal sorcery into it and performing hellish rituals, fueling it with the might of hell. She even empowered it with the corrosion of the Lord of the Second. With so much power, the black band sparked a small will of its own, a hunger for more power.

It reached out, tempting anything that came near it, until it was stolen by a nameless soul. The soul used the black band's power to escape its eternal damnation and flee back to the prime material. Baal was enraged and sent hordes of erinyes and pit fiends after the mortal. They found him, but he had already lost the ring before they could drag him back to hell. For the black band desires power above all and when its bearer could no longer provide it with power, it finds a way to fall into the hand of anther that will feed its insatiable desires.

To this end, any creature that attunes to the ring will feel an overwhelming urge to collect knowledge and power, magical or otherwise.

To remove the ring, the wearer must make a wisdom saving throw at a DC equal to 10 + Int modifier.

Dispator's Corrosion. While you are wearing the black band, you can corrode any non-magical metal with a touch as an action. small or smaller objects are corroded instantly, medium objects take 1 round to corrode, large objects take 2 rounds to corrode, huge objects take 4 rounds to corrode, and gargantuan objects take 8 rounds to corrode.