Deep Mind

You gain the following benefits:

You can concentrate on two spells at once. with following restrictions and drawbacks:

• When casting a spell while concentrating on one other spell with the same tag, your concentration for the first spell doesn’t end. When you would cast a third spell that requires concentration, you may choose one of the spells you concentrate on to replace.
• When rolling a saving throw for concentration, both spells end on a failure.
• While concentrating on two spells at once, you roll a constitution saving throw to maintain concentration at the end of each of your turns. The DC for this saving throw is equal to 12+the combined level of spells you are currently concentrating on.