Prey of Choice

Feats

You have a particular taste for hunting spellcasters. Whenever an enemy casts a spell or uses a spell-like ability, you and your animal companion gain a +2 bonus on attack and damage rolls against that creature until the end of combat. Additionally, whenever an enemy within 10 feet of you or your animal companion makes a concentration check, it must roll twice and take the worse result. You must be at least 16th level to select this technique.