Umbra Cinder

You put the lump of black coal in the palm of your hand, and dark purple flames erupt from the coal. The flame deals no damage to you, and is around the size of a small apple. The coal levitates around 3 inches above your palm, and follows your hand. Instead of light radiating around the flame, darkness radiates around the coal within a 10 foot radius. Any creatures, other than the caster, that do not have night vision are immediately blinded when in the 10 foot radius. If the coal is destroyed, you cast another spell, or a minute passes, then the spell is canceled. You can use the spell on a normal attack, dealing 1d8 fire damage to any target within 60 feet, and making the spell dissipate, or you can use it to make the whole room dark for 1 minute. It also can be used to ignite anything flammable it touches. When it spreads, the fire is also the same dark purple flame that spreads darkness, (and deals 1d8 fire damage) but will not be moved by your mind. After the spell is canceled, the coal disappears.