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Were they making entire expansion sets about them?
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Wow, you're right.
I never realized just how unoriginal Blizzard are
Just look at Wrath of the Lich King. Undead have been a part of Warcraft lore for over a decade, but they got their own expansion when the zombie craze was at its peak.
COINCIDENCE? I think not.
Look at Cataclysm. The dragons, a part of Warcraft lore for a decade were given their own expansion, obviously to cash in on the resurgence of popularity of contemporary fantasy post-Eragon.