The Eon Shrine is a temple dedicated to Eevee and the Eeveelutions, located in the fansite sector of Eevee's HQ. It houses the ghosts of Eevee, Vaporeon, Jolteon, Flareon, Espeon, and Umbreon, all of whom Kat herself once slew. The shrine is watched over by Leafia and Glacia, sisters of the six ghosts. Kat intended to kill both of them as well; however, Route 50 was eventually released and the Eon Shrine- along with the rest of EHQ- was abandoned.
More information will come as the Mythos team investigates this matter more thoroughly