• c. -750 DR
  • An order of powerful Netherese wizards takes up residence amid an unexcavated section of Melairbode, in what is now known as the third level of Undermountain. The name of the outpost is lost to time, though some scholars refer to it as the Sargauth Enclave. They begin experimenting on mantles, magical fields similar to elven mythals. »

  • -339 DR [Year of Sundered Webs]
  • The Sargauth Enclave in present-day Undermountain is partially destroyed as a result of Karsus's Folly, and the Netherese arcanists that survive are twisted into magically potent undead that will become known as the Skulls of Skullport. These Skulls find that they are now part of the mantle that they were working on, and now cannot travel beyond it's borders. »

  • 1358 DR [Year of Shadows]
  • Halaster's control of Undermountain's wards wavers for the first time in centuries, and the Skulls are briefly able to tap into a small piece of his power. The unlucky victim of the Skull's newfound magical powers is an archmage visiting Skullport at the time in disguise. The Rag Mage, as he came to be known, is transformed by the Skulls into his current form, capable of feeding Skullport's mantle by slowly bleeding the magical and life energies of victims through his servitor raggamoffyns and channeling it into the mantle of Skullport. »

  • 1369 DR [Year of the Gauntlet]
  • Highharvestide Arcturia, one of Halaster's apprentices, is slain in Undermountain by four frost giants (members of the Twisted Rune) in the Room of the Grim Statue. Despite her death, she still managed to kill two fo the giants and was able to activate her contingency magic to remove her corpse and leave an illusion of her dead body. After Arcturia's body was returned to her sancuary, she rises as an undead creature known as a worm that walks.

    The arch-mage Shradin Mulophor (who is without Halaster's protection due to his abduction) is shouted to death by the Skulls of Skullport, and the Skulls become the undisputed masters of Skullport in Undermountain. The form of Shradin and all his possessions instantly turns into a pale red mist and floats away. The Skulls had actually transformed him into an entity capable of feeding on the physical components of victims and channeling that power into the mantle surrounding Skullport.

    With Shradin and the Rag Mage, 2 Skulls are now able to escape the confines of their prison for a short period of time, typically into the halls of Undermountain. They try to keep this fact from becoming common knowledge.

    Halaster, who had foreseen this possibility long ago, is sure to oppose the Skulls in their attempts to be free of the mantle of Skullport. »