Eldritch Battery

You are able to concentrate on two spells at once.

When concentrating on two spells or effects you suffer the following effects:

• At the end of your turn, you take psychic damage equal to the total spell level of both spells being concentrated. This damage cannot be reduced or prevented. You roll a concentration check on taking this damage.
• You have disadvantage on checks to maintain concentration.

Changes:

• Removed advantage to concentration checks when concentrating only 1 spell or effect
• Added damage taken when concentrating 2 spells