You can attempt to concentrate on 2 spells at the same time, each round roll a DC 16 Wisdom saving throw and on a fail take 1d6 psychic damage for every level the second spell you were focusing on (example haste, lvl 3 spell : take 3d6 psychic damage). If you take the damage you can choose to keep the concentration or you can stop one of the spells to terminate the effect. When you would make a Constitution saving throw to maintain the concentration add the level of the second spell to the DC (example haste, lvl 3 adds +3 to the DC) and on a fail lose concentration on both of the spells.
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