Fraz-Urb'luu's Gem

Having previously been imprisoned for many mortal lifetimes on the Material Plane. Fraz-Urb'luu had taken steps to bind himself to his layer of the Abyss. As soon as he felt the tug of Gromph's spell, Fraz-Urb'luu transferred his evil life force to a specially crafted, magically protected receptacle - a black jewel. However, the spell proved irresistible, and the precious receptacle was cast into the Underdark. As further indignity, Fraz-Urb'luu found himself trapped within the gem, unable to escape while on the Material Plane.

Anyone who touches the gem risks falling pray to delusional madness. A duergar ale merchant named Krimgol Muzgardt found the gem and took it to Mantol-Derith. By the time he arrived, Krimgol had succumbed  to the delusion that he was a Calassabrak— a duergar without honour. He paid Yantha Coaxrock, an honest svirfleblin mage, to appraise the jewel, hoping that he could use it to buy back the goodwill of his clan. Touched by the gems madness. Yantha lied to Krimgol and told him the gem was worthless. she offered a lump or gold in exchange, whereupon Krimgol suspected treachery and demanded the gem's immediate return. While Krimgol and Yantha argued, one of Yatntha's apprentices tried in hide the gem for his mistress but succumbed to its evil power. The apprentice, Flink, took the gem to the drow enclave, hoping to trade it for some rare spell components that he imagined Yantha needing to make Krimgol go away. A gargoyle assigned to watch for thieves spotted the gem and wrestled from Flink. who hid for fear of incurring Yantha's wrath. Soon thereafter, the delusional gargoyle laid eyes on a draw assassin named Kinyel Druu'giir and was instantly smitten by her. The gargoyle gave her the black gem as a token of its devotion, which she, in her madness. mistook as a payment from the drow enclave to assassinate Lorthuun. a maimed beholder allied with the Zhentarim.

Yantha's theft of the gem led Krimgol to leave and return with duergar reinforcements. They attacked the svtrfneflin enclave and captured Yantha, triggering open conflict between the two enclaves. With the fragile truce in Mantol-Derith finally broken, the drow are preparing to take out the weakened duergar and svirfleblin forces. Meanwhile, Druu'giir has infiltrated a drow delegation sent to meet with representatives of the Zhentarim enclave to discuss how best t0 divvy up Mantol-Derith between them.