"...It's said that the fangs of trolls possess a special power, the stronger the troll warriors are, the more obvious this power in their fangs is..."
"During the era when the Ancient Giant Troll Empire ruled, many tribes of primitive humans worshipped and conducted rituals for the fangs of mighty dead troll warriors, borrowing the miraculous powers contained within them..."
Rein read with great interest.
Although what was written in the ancient texts was still vague, it sketched out a rough internal logic of why the Ancient Giant Troll's fangs had facilitated his class change to Beast Priest (Legendary).
"Just as I guessed, there's no influence from the Evil God inside. This must be some unique ability from an ancient race..."
Several days passed.
Rein spent his days methodically alternating between general education classes and the rapid stream chamber, practically living a two-point life.