Ten thousand years ago, Soridormi represented Nozdormu at the gathering of dragons in the Chamber of the Aspects for the creation of the Dragon Soul. She contributed her own and her mate's essence to the Soul's spell matrix. Soridormi was betrayed along with the rest of the dragons when Neltharion attempted to use it to gain control of the Flights, but was saved by the intervention of Korialstrasz.
Although Soridormi represented Nozdormu during the creation of the Dragon Soul along with the other Aspects (he having been busy preventing the timeline unravelling due to the Old Gods' interference), she does not appear during the flashback of the event against Yogg-Saron in Ulduar.
This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
It is speculated she is likely the mother of Anachronos, the Heir of Nozdormu. Anachronos having been chosen as Nozdormu's heir implies he might be the progeny of the primary consort.