Dweomer Retaliation

Abjuration
Level: Artificer * 3, Sorcerer */Wizard * 3
Components: V
Casting Time: 1 Immediate Action
Range: long (400 ft. + 40 ft./level)
Target: one creature you counterspelled since your last turn
Duration: instantaneous
Saving Throw: None
Spell Resistance: yes
  You may only cast this spell immediately after successfully counterspelling an opponent. Drawing upon the residual energy of the countered spells, you gain a number of temporary hit points equal to the level of the countered spell plus your Charisma or Intelligence modifier (for sorcerers and wizards, respectively your counterspelled opponent takes damage equal to this amount.
  If the countered spell was at least 4th level, you and your opponent make opposed concentration checks. If you beat your opponent by 10 or more, you retain this spell (or its spell slot, if you are a sorcerer) as if you had not cast it.