Moon Crystals

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"Every Spirit Treasure has Ranks from 1 to 10! If you can only see them now it means you've finally unlocked the ability to do so." He sighed. "They raise in Rank by tending to them, like a garden, give them their favorite fertilizer and stuff. Favorable conditions, and of course, spiritual energy. As you grow stronger they'll also rank up."

"I see… I guess that's where you enter, my personal graveyard gardener!" I laughed. "So what happens after Rank 10?"

"Sigh, can't you just guess?" He sighed.

I pointed my hand at my again, as if I was about to smack him.

"O-Okay! I'll tell you!" He cried. "Once it reaches Rank 10 it can evolve… There's Lesser Spirit Treasures, Mid Spirit Treasures, High Spirit Treasures, and Divine Spirit Treasures! So in total, you've gotta make them go through 40 Ranks! Pretty harsh."