• -1396 DR
  • End of the Fourth Seros War
    This war destroys the Second Kingdom of Kyron, setting back koalinth population for decades. The Emerald Eye is recaptured, and the possessed mermaid is believed dead, buried in a collapsed reef on the Plains of Duna, which hereafter are called the Haunted Plains. The new merfolk community, under the auspices of the kindly Coronal Vaequiis, is the kingdom of Thalvan, led by King Darmox. »

  • 654 DR [Year of the Coveted Briars]
  • Battle of the Haunted Plains
    After their defeat here, more than 80% of all merrow in Seros flee or are driven south, behind the Sharksbane Wall. The remainder survives within the Hmur Plateau or among the ruins on the Haunted Plains. »

  • 727 DR [Year of the Purloined Throne]
  • Rise of Keryvyr
    Unnoticed during the Tenth Seros War, sea elves clear and resettle a portion of the cliffs above the Haunted Plains (the Bay of Yhaunn off Sembia). Within twenty-five years, this grows into a string of cities and outposts spanning the western cliffs. »

  • The sea elves of Seros establish Keryvyr in a section of the cliff overlooking the Haunted Plains (present-day Bay of Yhaunn off Sembia). »

  • 771 DR [Year of the Stalking Knight]
  • The depths of the Dragonmere off Cormyr become the home to the sea elf kingdom of Naramyr, a former barony of Aryselmalyr. Sea elves resettle here after being refused to form colonies on the Hmur Plateau by Eadraal. Their best protection is the Haunted Plains, which keeps all but koalinth and other monsters from their borders. Alliacnes with Keryvyr also help. »