A red gemstone
Attunement
A fist sized glassy red gemstone that has a glowing ember in the center. The stone emits an aura of warm air in a 10-foot radius around itself.
The stone must be held in both hands for 1 hour while it vibrates and produces sparks as you struggle to keep hold of it. At the end of the duration you must make a DC 20 Strength saving throw.
On a failed save the stone bursts into flames, causing you to take 8d6 fire damage. If you fail to attune you cannot attempt to do so again until you have finished a long rest. On a successful save you attune to the stone. While attuned to the stone you gain the following features.
Attuning to the Cinder Stone grants you knowledge of Cinder spells which are themed around heat and flames. The stone must be held in the hand to cast these spells.