The Three Demon Regent Alliance Invasion

During the Age of Humanity, three of the Demon Regents formed an alliance, a rare thing to occur, in order to join forces in an invasion of the independent human nations.
The goddess Speestra found out before any other and empowered many of her champions to the fullest extent allowed by the Material Gate to form a quick response, and her highest priestess took it upon herself to walk over the planar edge to the Abyss and close the gateway from the other side.
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