You have learned the mental discipline and focus required to split your mind and concentrate on multiple spells at once. You gain the following feature:
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Whenever you cast a concentration spell, and are already concentrating on at least one other spell, you may choose to maintain concentration on a number of those spells up to, but not exceeding, your greatest spellcasting ability modifier. If you do, you take an amount of psychic damage equal to the total level of all spells being concentrated upon, and your hitpoint maximum is reduced by the number of spells being concentrated upon. In addition, you take this damage and experience this hit point reduction at the beginning of each of your subsequent turns during which you continue to maintain concentration on multiple spells. The damage you take as part of this feature ignores resistance and immunity, and does not require you to make a Constitution saving throw to maintain your concentration. All maximum hit point reductions from this feature are restored during your next long rest.