"Then I'll make some space and demonstrate."
Ishaza takes a few steps back, extends her hands in front of her in the air, and hums lowly.
Hysh upwells from her heart again and gathers between her hands, forming slowly into a crystalline rigidity. It hovers in the air between her hands, shimmering like a prism, and stays.
Ishaza raises the note she's humming, and the prism shifts higher; she lowers the note and the prism falls. The Hysh is so dense that it's almost a solid object this way.
Eventually she quiets her voice again, and a tiny orange crystal like the ones Alethia has seen in the bedroom chandeliers falls out of the air and into her cupped hands.
"I'm not much of a crystal-singer," she says, "But it's a good shaping exercise, and it lights the castle."
She extends the glowing, thumbnail-sized crystal to Alethia. "It's quite magically inert," she says. "It's just crystallized air, there's no Hysh in it except in its formation. It's safe to handle. And yours, if you want it."