Alexstrasza is a main character in the Warcraft lore, and a major player in World of Warcraft appearing in many different quest-lines. As Queen of the Red Dragonflight, she is the Aspect of Life. The Aspects were blessed by the Titans, creators of Azeroth, with a piece of their power. Alexstrasza received Eonar's gift and was charged with watching over all life on Azeroth. She fought off Deathwing with the help of the mage Rhonin and the other Aspects at Grim Batol years prior to Cataclysm, where Rhonin destroyed the Demon Soul. In World of Warcraft: Wrath of the Lich King, she appears as a quest giver in Dragonblight, Northrend, in her elven guise. In dragon form, she appears after the battle of the Wrathgate to lament the loss of life and to show players what happened there in the form of a cut scene.
In Cataclysm, after fighting with Deathwing in the Twilight Highlands, she was able to injure him to the point of believing she had defeated him. Unfortunately, in her weakened state, she found this was not the case, and was rescued at the last second as one of her brood protected her escape. It is likely she will have some part to play in Deathwing's demise, as she did with Malygos, another Dragon Aspect.