• -3495 DR
  • Birth of Congenio Ioun, the first major arcanist of Netheril and the creator of the Ioun's Stone. »

  • -3462 DR
  • Congenio Ioun, at the age of 33, creates his first magical item, Congenio's pebbles (later known as Ioun's Stones). During his lifetime, he creates over 30 different kinds of Ioun Stones. »

  • -2680 DR
  • Congenio Ioun changes the names of his magical items (Congenio's Pebbles) to Ioun's Stones. »

  • 1271 DR [Year of the Shattered Wall]
  • The Ahlors Protectorate is ravaged by an attack from an unexpected quarter. Iryklathagra, exploring a saline environment wholly unlike that in which she was born by means of an iridescent ioun stone, plunders the trade city of Otanyn. In addition to seizing a fortune in pearls, she makes off with Kayas the Krakenscourge and the corpse of the weapon's last triton wielder in her claws. The Krakenscourge has since lain unused in her hoard. »