Onyxia and nefarian were not protodrakes...
Also what kinda fucking chickens are you eating, or do you think all things with feathers are chickens?
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Opposite, consuming the drakes returned his sanity.
he was perfectly sane when we killed him, he just was fucking sick of humanity at that point, and we couldnt let his plans come to be, cause yeah his plans were perfectly sane, but well remove all magic from mortal races is not something the other dragons, and ESPECIALLY the mages of dalaran, agreed with.