Blazing Blade

You speak a word of power and with it ignite a weapon you are holding in magical fire. This lasts for 1 minute, until you cast another spell targeting your weapon, you fall unconscious or you end it as a free action. For the duration of the spell all attacks with the weapon deal an additional 1d4 fire damage and the weapon counts as magical for the purposes of overcoming resistances to non magical attacks. The amount of fire damage dealt increases with your level reaching 1d6 at 5th level, 1d8 at 11th level, and 1d10 at 15th level.