Soul dungeons were filled with unique rewards. For example, Moss Cave had the Potion of Explosive Growth, the Beast's Tower had Violf's Platinum, and the Saul Graveyard had dragon materials.

What would the Rocking Stone Cave give?

"Money, precious stones, and Acasus's Book," Sephiro said.

"Acasus must be referring to... The Legendary Tamer, Acasus, right?" Kang Oh asked.

Acacus was the world's most powerful and renowned Tamer, who controlled five legendary beasts that were said to equal dragons in strength!

"Yes. Acasus's Book can be used to either increase a pet's abilities, or teach you a random Tamer skill."

While nurturing Waryong, Sephiro occasionally visited the Tamer Guild. That's why he knew so much about Acasus.

"That book's a must-have for a Tamer."

"Indeed."

"How much do you think it's worth?"

"I'm not sure. I'll have to figure it out."

"Ah, I'm so jealous!"

He was jealous that his neighbor just bought some land! And it wasn't just any land; it was a soul dungeon! 

"You already have three soul dungeons."

"And I don't have any," Eder added.

"Greedy people always...