Prerequisite: Must be able to cast at least one spell
You can concentrate on two spells at a time but must make a concentration check at the start of each turn. The DC begins at 5 and increases by 1 each round. When you fail the concentration check for the first time at the start of your turn, you can choose which spell is lost and you can continue concentrating on the other.
When you take damage, you make a concentration check as normal for each spell and can lose neither, one, or both.
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