Guardian

Guardians refer to different enemies that appear in SS undefined and.

Skyward Sword
In SS undefined, there are two types of Guardians that inhabit Silent Realms. One looks like a mace-wielding Darknut, which can run quickly, but is limited by obstacles and generally confined to certain areas. The other type is a robed beast that slowly hovers around with two blades, passing through any obstacle in its way, and vaguely resembles a Garo. Both types have three distinctive glowing eyes and pure white armor and robes laced with black and gold. As Link is unarmed while in Silent Realms, Guardians are effectively indestructible.

While Link is in a Silent Realm, he has to collect Sacred Tears to successfully complete the trial. The Guardians will try to prevent him from accomplishing that goal by chasing him as soon as Link leaves the safety of the circle he starts in. If they land a single hit on him, Link's spirit will shatter and he will have to restart the trial. Link can stop the pursuit by collecting a Sacred Tear, which will return the creatures to their original positions in their inert statue-like state for 90 seconds. A flower above the Spirit Vessel acts as a timer, with its petals disappearing to indicate how long the Silent Realm Guardian will remain inactive. If Link is spotted by a Watcher or touches Waking Water, the effect of the tears will be nullified and the Guardians will reawaken, resuming their search for the young hero.

Breath of the Wild
Guardians in are a different enemy and bear no relation to the Guardians of SS undefined. They appear as ancient machines with an octopus or squid-like design that resembles an Octorok. Guardians are powerful enemies, with high HP, and a laser beam attack that deals six hearts of damage to Link. When defeated they drop Ancient Springs and Ancient Screws, suggesting they are mechanical in construction. Smaller variants of Guardians can be found within Shrines, while deactivated Guardians can be found in various locations around Hyrule.

Trivia

 * The pose of the mace-weilding Guardian is identical to that of the black Temple of Time Darknut in before it turns to face Link.
 * Guardians are very similar in function, and somewhat in appearance, to the Phantoms seen in and.