You attempt to a control a humanoid that you can see within range. It must succeed on a Wisdom saving throw or be charmed by you for the duration. If you or creatures that are friendly to you are fighting it, it has advantage on the saving throw.

While the target is charmed, black tentacles of pure void, invisible to anyone but you, connect the targets head to your shoulders, and last until this spell is dispelled. You have a telepathic link with the charmed person as long as the two of you are on the same plane of existence. You can use this telepathic link to fully control the creature while you are conscious (no action required), which means that the creature takes only the actions you choose, and doesn't do anything that you don't allow it to do. If the creature completes the order and doesn't receive further direction from you, it defends and preserves itself to the best of its ability.