An Unexpected Explanation

"I'm not trading for it because I can't offer anything better," Keldon stated with his friendly smile.

Perplexed, Karos blinked. "But that's not what I want. I want something I can use now, so--"

"The hardest part of using cores is finding one that's compatible. Sure, any core with a shared affinity is technically usable. But if you want to train effectively, you'll want to seek cores with similar essence natures, or even from a similar species," explained Keldon, catching the lynx off guard. "Testing for a core's nature is difficult and very few experts can offer this kind of service. Sadly, I don't currently possess the resources to make such tests. Even if I did, however, I wouldn't accept your father's core. You've successfully gained a fully compatible, perennial core. You may never find another core with such compatibility."

'Well…"

"You still want to trade it?"