Sindragosa details in WoW

 formerly the prime-consort of Malygos, is a mighty frost wyrm who was raised by the Lich King himself at Sindragosa's Fall in Icecrown. She is just the frost wyrm that the Lich King raised in the Wrath of the Lich King cinematic, as the same scene is played out after completing the quest Where Dragons Fell.

Sindragosa is briefly found in the Pit of Saron, the second 5-man Icecrown instance, after the defeat of Scourgelord Tyrannus. By the way, you can enjoy the most secure
 powwerleveling. here! While the leader of the army of liberated slaves commends the players for their efforts and their bravery to set them free, Sindragosa flies up from the pit below and unleashes her fury, killing the leader and his army. The players are pulled back to the entrance tunnel by Jaina Proudmoore or Sylvanas Windrunner, saving them from a grisly death.