Request - Part 2

Raising his brow, Foster picked up the purple marble, "Really? How so?"

"That isn't a crystal, it's a pill. Whoever takes it gains the 'Rock Armor' spell... It lets you create, well, an armor of rock directly onto your or someone else's skin. Obviously I don't have to tell you why that is dangerous, you understand magic feedback well enough, anyway... If you learned this spell the regular way, this wouldn't be an issue, but this pill will force the energy it fuses with into an elemental state for a moment, and if you're not a high-tier mage, then you're going to feel the effects of magic feedback instantly." The hogmir explained, bitterly looking at his arms, which had been turned into rock due to magic feedback.

"...Magic feedback only happens with elemental mana, right? Focusing on the 'mana' bit for now. What if internal energy takes on that elemental aspect instead?"