The Gate of the Goat Key is a golden Celestial Spirit Key bearing the crest of the Goat. The anime portrayed the gold key with a white center bearing the crest of the goat. The blade is sculpted to appear similar to a goat's head with horns sprouting out of each side and curling towards the center.
While in possession of the key, a Celestial Spirit Mage may be able to summon the Goat Capricorn by reciting the quote, "Open the Gate of the Goat! Capricorn!". This summons Capricorn, a humanoid goat wearing a formal attire who is capable of hand to hand combat.