Felix Caelus

Something twists in Jim's insides at the mention of using souls to power the magics they're putting on such frivolous things. Maybe the definition is different here? He looks at the crystals as though trying to see if they had somehow been infused with or soaked in blood but they're all clear, small though they are.

The very essence of a being, captured into a tangible thing so small? Jim can hardly make sense of it.

He reaches out and intends to touch one of the stones, as if this will tell him some useful information. But Captain Kirk has no basis for sensing magic other than the odd smell that accompanies the summoning of Ghost Puppy faintly and the tingling warmth of Felix's healing spells.

And the rock feels like any other he's ever touched.

"Anyone can use these?" That doesn't sound like an invitation for their abuse, no. Certainly not.