Darklight Flame

You engulf your weapon used to cast this spell with dark greenish-black light and make a melee attack with it against one target within 5 feet of you. On a hit the target suffers the weapon attacks normal effect and the erosive dark light causes the target to suffer 1d6 additional Acid Damage from this attack. If the target has taken Acid Damage from another source than this spell within the last hour, you can add your Spell Casting Modifier to this damage.

At higher levels: The additional Acid Damage is increased by 1d6 when you reach 5th level, 11th level and 17th level.