Power-crystal

Stone Lord crystal that hums with stored lightning or aches with what it spent.

A clenched-fist-sized chunk of crystal, salvaged from Stone Lord material. Charged, it thrums or crackles with power; depleted, it fills the bearer with emptiness and longing.

When you brandish it at elemental energy, roll +CON to absorb and charge it, risking harm, instability, or cracking. A skilled arcanist can spend a charged crystal to fuel magic, but reckless use may split or explode it.