From WoWWiki
Heeding the call of their goddess,
Ysera, the Green Dragonspawn stand to protect
Azeroth from the waking evil within the
Sunken Temple.
Dragonspawn form the ranks of the ground army within each of the five great
dragonflights. Among the murk-ridden marshes of the
Swamp of Sorrows, the Green Dragonspawn patrol at the behest of their dreaming mistress; Ysera has warned of a lurking terror within the temple, and her loyal servants are determined to protect the land from the emerging doom.
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