You can maintain two spells with concentration at once. You can do this a number of times equals to your stronghold level, after witch you must make an extended rest in the stronghold to refresh this ability.
Additionally, you can spend 1 month + 1 week per spell level - 1 week per tower level at the Stronghold Tower to create a new Spell. The cost for the materials needed to create the spell depends on the Spell level from level 4 or higher.
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