Frost Fire

4th-level Enchantment (Bard, Sorcerer, Wizard)

Casting Time: 1 action
Range: 120 feet
Components: VSM (A piece of ice or snow, and a match)
Duration: Up to 5 minutes
You pick an open flame that you can see within range. It now glows a burning blue and white. Whenever a creature comes into contact with the flame it takes 5d6 cold damage + 2d6 fire damage. This flame is considered magical and cannot be extinguished by normal means. The enchantment lasts for the duration, or until dispelled 
At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the spell's damage increases by 2d6 for each slot level above 4th. If cast using a slot of 7th level or higher the flame becomes permanently enchanted.