Alchemist Oil

This green oil smells of smoke. The oil can coat one weapon or up to 5 pieces of slashing or piercing ammunition. Applying the oil takes 1 action. For 1 minute, the coated  object sheds bright light in a 20-foot radius and dim light for an additional 20 feet. Additionally, the weapon is considered magical and anytime it deals damage, it deals an additional 1d4 fire damage. 

Notes: Damage: Fire, Damage, Buff, Combat, Consumable