Summon Soul

You focus on one of your filled capture devices, and summon the captured soul to an unoccupied space within range. The soul must be from a creature with a challenge rating of 1 or lower. 

You can spend an action to end the spell, returning the soul to its capture device.

Once summoned, the soul assumes a spectral version of the form it had in life. It maintains its stats and abilities. The soul is an ally to you and your companions. In combat, it takes its turn on your initiative. It can move and use its reaction on its own, but the only action it takes on its turn is the Dodge action, unless you take a bonus action on your turn to command it to take another action. The soul cannot move more than 100 feet from its capture device.

If the summoned soul drops to zero hit points, it is permanently dispelled.

If the summoned soul is not returned to its capture device before 1 hour has elapsed, it is permanently dispelled. 

If the soul’s capture device is damaged, the soul is permanently dispelled.

At Higher Levels. When you cast this spell using a spell slot above 1st level, you can summon the captured souls of creatures with higher challenge ratings.