Furious Concentration

Study and deep understanding of magic has allowed you to focus your Rage. You have honed your control of the weave blending it with your fury allowing you to fuel your magic even while in the midst of combat. 

Whenever you are already concentrating on a spell and enter a rage as a Bonus Action, you make a concentration check vs 10 plus the spell level of the spell which you are concentrating on. If the check is successful you maintain concentration on your spell as long as you maintain your Rage. You continue to make future concentration checks vs damage as normal but anything that would normally make your rage end early also ends your concentration.