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Vampire King Apollyon
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It was easy to teleport to this place when one had visited here too many times.
Apollyon became familiar with all the places he frequented in the Faerie Realm.
Prince Aspen was an effective ally and a guide to their Kingdom.
Apollyon had stayed in the Spring Courts for a year at most, so it was easy to navigate places through teleportation.
He would have a hard time using that ability if he wasn't acquainted with the places, which were the limits of teleportation.
Apollyon wasn't convinced if that would work in a spiritual Realm such as Hell unless he found a way to separate his spirit from his body, and Luna would take him there.
The only way to defeat the Archdemons was to become an Archdemon himself while not losing the real him, similar to Luna's.