Divided Attention

It's unclear if you're able to pay great attention to things, or the exact opposite... You have the ability to keep your concentration on two spells at once, but at a cost. When you cast your second spell that requires concentration, roll a d4+1 and subtract the result from your Spellcasting Ability. While concentrating on two spells you have disadvantage on concentration checks. If you fail your concentration check, you only lose concentration on one spell, you choose which one. Once you use this ability, you can’t use it again until you finish a long rest. The ability score penalty disappears after a long rest.