Expanding Storage Space

What's happening?

Could this be caused by a Level 5 mutant beast crystal core?

Thalia picked up a Level 5 crystal core and dropped it into the Level 3 beast-hide pouch. Right away, the prompt sounded again. "Harvest?"

So it's really the Level 5 crystal core causing this!

Thalia's eyes brightened instantly.

She quickly activated her ability on the beast hide pouch.

Ding! "Energy -1. Harvest success