Agartha is a subterranean civilization made by large olm-people, spanning three Ages. It may refer to:
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MA Agartha, Golem Cult ← This one has been colonized by humans, who revere the olm-like survivors and animate statues of them.
LA Agartha, Ktonian Dead ← This one is entirely human, though its leaders are Necromancers who reanimate the ancient olm-like Oracles.
All three have Earth magic, and a plethora of summons (or constructs, and/or reanimations) uniquely available to them.