How can I free the Unicorn?

Hint 1 of 5:

You can either free the Unicorn through brute strength, use of a wand, or
through a gift.

Hint 2 of 5:

Have you seen Unicorns elsewhere on your adventure?

Hint 3 of 5:

Don't continue on until you have been to the Plane of Transinfinite Splendor.