Venemous Strike

As a part of the action used to cast this spell, you embue a magical poison on a weapon, melee or ranged you touch and must make an attack with it against one creature within the weapon's range, otherwise the spell fails.  On a hit, the target suffer's the attack's normal effects plus 1d4 poison damage, the target becomes poisoned until the end of his next turn.  Targets resistant or immune to poison, they do not become poisoned.

The spell's damage increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).