• 171 DR [Year of Unkind Weapons]
  • Halaster's Hunts
    Halaster Blackcloak begins his Halaster's Hunts in Undermountain. Instead of releasing his summoned demons and other outsiders after they had completed their task of constructing Halaster's Hold, he sends them into Undermountain to drive off any inhabitants there. They last until 308 DR. »

  • 250 DR [Year of the Storm Crown]
  • Halaster Blackcloak makes Undermountain his domain. »

  • 308 DR [Year of Promise]
  • Halaster's Hunts
    Halaster's Hunts, a series of exterminations of drow and duergar in Undermountain by the mad wizard Halaster Blackcloak, comes to an end. »

  • 309 DR [Year of the Cascade]
  • After many years of exterminating large pockets of drow and duergar, Halaster Blackcloak now rules the Underhalls of Undermountain beneath Waterdeep. »

  • 326 DR [Year of Secret Slaughters]
  • Halaster Blackcloak discovers the Crystal Labyrinth in Undermountain, and begins using it to store his most prized possessions. »

  • 482 DR [Year of the Blighted Vine]
  • A Tethyrian warlord named Ulbaerag Bloodhand conquers the ever-feuding tribes of Blackcloak Hold. Within a generation, Ulbaerag unites the tribes as one. The settlement becomes known as Bloodhand Hold. »

  • 658 DR [Year of the Dangerous Game]
  • Jhesiyra Kestellharp, an ex-apprentice of Halaster Blackcloak, accepts the office of Magister. »

  • 668 DR [Year of the Telling Tome]
  • Wizards begin mysteriously disappearing this year from Myth Drannor and all of Cormanthyr; the only clue is that all the visible gates throughout the city crackle ominously and flash blue lightning within their boundaries. (In truth, Halaster Blackcloack of Undermountain is abducting at random and banishing them to the Underhalls.) »

  • 680 DR [Year of the Long March]
  • After more than a decade, wizards of the Guild of Naturalists piece together the clues and realize that Halaster Blackcloak has been abducting wizards all throughout Cormanthyr in retaliation for their plundering of his monsters in Undermountain. The guild mounts a rescue expedition into the dungeon, which never returns, and they quietly end their sorties to Undermountain. Attempts to dispel or destroy the gate connecting their hall with Undermountain meet with failure. »

  • 1148 DR [Year of the Angry Sea]
  • The necromancer Shradin Mulophor takes up residence in the ruins of Sargauth Enclave (after asking permission from Halaster Blackcloak and also becoming his apprentice), establishing a small trading settlement that will soon becomes known as Skullport, Port of Shadows. The Lord of Bones, as Shradin comes to be known, encourages trade with other Underdark powers by linking the River Sargauth with subterranean waterways and creating portals leading to distant seas. »

  • 1330 DR [Year of the Marching Moon]
  • Twisted Rune member Jhaniloth Puiral is destroyed by Prince Rythan of Tethyr. He was working with Priamon Rakesk on taking control of the many portals of Undermountain but switches his focus towards using Halaster Blackcloak's gates as a tool for the power of the Twisted Rune, and a means of escape. »

  • 1369 DR [Year of the Gauntlet]
  • Highharvestide The lich Priamon "Frostrune" Rakesk and the alhoon Ralayan the Ocultacle of the Twisted Rune kidnap Halaster Blackcloak from his seat of power in Undermountain. Halaster's Highharvestide results in the destruction of the village of Geniste and other chaos across Faerun, until his rescue by a group of adventurers.

    Piergeiron Paladinson destroys the dracolich Kistarianth the Red on the slopes of Mount Waterdeep during Halastar's Harvestide. The transformed red dragon was slain in life by Piergeiron's father, Athar the Shining Knight.

    The female old blue dragon Araugauthos the Bluetalon escapes from Undermountain during Halaster's Highharvestide. After slaying a great wyrm red dragon that laired near Citadel Amnur and claiming his hoard, she flies south to rejoin her mother Iryklathagra. »

  • The Seven Sisters thwart a plan involving drow and the Red Wizards of Thay orchestrated by a Shar-tainted Halaster Blackcloak of Undermountain to steal the secrets of silver fire from Mystra and her Chosen. »

  • 1372 DR [Year of Wild Magic]
  • The Shadovar city of Shade attempts an attack on Shadowdale. Dove Falconhand blasts one of the shadow princes with silver fire. Since Shadovars are living shadow magic, and silver fire pure weave magic, the collision tears a rift to the Nine Hells. Elminster, realizing that the only way to close the portal before a legion of baatezu pore forth into Toril was to close it from the other side.

    Once in the Nine Hells, he is abducted and enslaved by an outcast Arch-Devil known as Nergal, who wishes to discover the secret of Mystra's silver fire. While the arch-fiend continued to plunder Elminsters thoughts and memories, Mystra becomes aware of her favorite servant's plight and enters the Nine Hells herself to find him. Realizing that her presence was less than inconspicuous (due to the Pact Primeval that prohibits the presence of any god in the Nine Hells), Mystra retreats and dispatches more subtle agents to find him.

    First Halaster Blackclock, who Mystra promises to cure his madness. He is defeated by the hordes of baatezu.

    Mystra then sends the Symbul. After much searching, the Simbul finds Elminster (and Halaster), and together they defeat Nergal and return home.

    Mystra keeps her promises and partially cures Halaster. The goddess then blasts Asmodeus with Halaster's insanity. »

  • 1374 DR [Year of Lightning Storms]
  • Priamon Rakesk is fooled by Khelben "The Blackstaff" Arunsun, his former mentor but now hated adversary, into seeking what he thought to be an ancient Shoon artifact. With this artifact, Priamon tries to take over control of the Twisted Rune. Blackstaff then strikes a deal with Sapphiraktar the Blue. The Rune preferring to have the Blackstaff deal with the traitorous Priamon rather than having to deal with him themselves. The Priamon's immobilized body is teleported into Undermountain, where the Halaster Blackcloak, in possession of the liches phylactery, takes revenge on his former kidnapper. »