Ghost-type monsters.
To put it simply, Wraiths—ghost-type monsters that had materialized enough to be seen by human eyes—were already a well-documented phenomenon in academic circles.
Of course, just because they were documented didn’t mean they were common.
Ghosts were already hard enough to believe in—let alone ones that physically manifested.
That rarity alone made them stand out.
But just because Wraiths were rare didn’t mean encountering one was lucky.
Quite the opposite.
