Inspired by 'Combo' Spells to increase action economy, bypass concentration, and trying to stop hijacking it:
What if you could concentrate on multiple spells, but their effects combined for only a limited time?
Multiple Concentration
You may concentrate on multiple spells, but their power is limited. When you cast a Concentration spell while concentrating on another spell or spells, its effects last for one round. After that first round, both spells become dormant. At the start of each of your turns for the duration of the concentration, you may choose a single concentration spell's effects to be active until the start of your next turn.
The first round of each additional concentration spell does not count against the single concentration spell limit, until it becomes dormant at the end of that first round.
If you are required to make a Constitution saving throw to maintain concentration, you must roll for each spell individually. Roll for them in order of spell level, highest first, adding half the spell level to the DC of the saving throw. If you succeed on one, you do not need to roll for the others. When you fail a saving throw, you lose concentration on the associated spell as normal.
What if you could concentrate on multiple spells, but their effects combined for only a limited time?
Multiple Concentration
You may concentrate on multiple spells, but their power is limited. When you cast a Concentration spell while concentrating on another spell or spells, its effects last for one round. After that first round, both spells become dormant. At the start of each of your turns for the duration of the concentration, you may choose a single concentration spell's effects to be active until the start of your next turn.
The first round of each additional concentration spell does not count against the single concentration spell limit, until it becomes dormant at the end of that first round.
If you are required to make a Constitution saving throw to maintain concentration, you must roll for each spell individually. Roll for them in order of spell level, highest first, adding half the spell level to the DC of the saving throw. If you succeed on one, you do not need to roll for the others. When you fail a saving throw, you lose concentration on the associated spell as normal.
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