Horologium

Horologium (ホロロギウム Hororogiumu), "The Clock", is one of the Silver Key Celestial Spirits that is owned by Lucy Heartfilia.

Appearance
Horologium is a tall brown grandfather clock with long, black arms, a glass case, a Roman-numeral clock at the center and a small face at the top with slit eyes and a thin, twirly, mustache-like mouth. The glass case serves as protection for the one who is inside and Lucy usually uses this to protect herself from the cold. This case prevents anyone outside from hearing what the person inside is saying, so Horologium repeats everything the person inside says and then follows with a "...he/she/they say/s."

Personality
Little is known about his individual personality, as he only repeats what his owners say. It is clear though, that he deeply cares for his owner and even his owner's friends, as he has a habit of forcefully summoning himself to protect them.

Macao arc
Lucy summons Horologium to keep her sheltered on the snowy mountain where Macao Conbolt was last seen. As Horologium speaks for Lucy, he asks Natsu what job Macao came for in the first place. Natsu says it was to defeat a Vulcan. Just then, a Vulcan jumps down and sees Lucy inside Horologium and carries the two away. The Vulcan eventually brings them to a cave, and he circles around Horologuim and Lucy. The Vulcan walks up to the Celestial Spirit, who then disappears, leaving Lucy unprotected.

Daybreak arc
On their way back from their mission, Natsu, Lucy and Happy go through a swamp. Lucy summons Horologium to walk through it. Lucy comes out of him after Natsu attacks Gray in a bush.

Galuna Island arc
As Happy, Gray, Lucy, and Natsu explore Galuna Island, Lucy hides inside Horologium again. When they run into Angelica, Lucy and Happy gets out of Horologium and runs.

Loke arc
Lucy briefly summons Horologium and all her spirits when she tries to convince the Celestial Spirit King to allow Loke back in the Celestial Spirit World.

Oración Seis arc
When Nirvana was being destroyed, Lucy manages to escape under the protection of Horologium. Lucy wonders how is it that he came to her aid and he explained that he passed the gate through his own will because Lucy's Magical power has become greater than before, allowing him to be summoned without her consent.

Edolas arc
Lucy explains to Natsu that Horologium passed through the gate and hid her away in an alternate dimension, telling her that he had sensed a disturbance in space, when Natsu asked her how she managed to avoid being turned into a giant Lacrima like the rest of Magnolia Town.

Tenrou Island arc
Horologium saves Wendy from Hades's attempt to cast Katsu. Horologium explains to Lucy, Gray, Natsu and Erza that he was in Automatic Danger Response Mode and detected a dangerous threat. Lucy recalls all the times she was in danger and Horologium didn't help. Horologium apologizes and says the danger was higher than Lucy's previous ones. Horologium lets Wendy go, giving her new clothes. He goes back to the Spirit World after giving everyone one last warning, as he cannot summon himself again.

Key of the Starry Sky arc
Note: Events in this arc occur only in the anime and do not constitute canon material.

Grand Magic Games arc
Horologium celebrates Lucy and her friends' return from Tenrou Island when Virgo brings them to the Celestial Spirit World. During the celebration, Wendy thanks Horologium again for saving her and how embarrassed when was for being naked inside of him. Horologium finds himself at a loss of words when this is brought up, so Lucy just tells Wendy he means to say it was no big deal. Before Lucy and her friends are sent off, Virgo tells Lucy that time in the two worlds are different. Horologium waves after hearing this, as the Mages realize they wasted the three months of their training in the Celestial Spirit World.

Magic and Abilities
Inner Body: He keeps people safe within his clock body and he narrates for those inside him. He can be used in both non-combative and combative situations. Lucy uses him as shelter and transport when traveling in snowy and muddy area. In combat, he can protect the person inside him with his hard-wooden body. However, Horologium does not seem to have combative moves. He is also mostly on a time limit: he will transport back to the Celestial Spirit World once the time is up, leaving his occupant behind, regardless of any danger he or she may be in. He is also able to force-open his Celestial Gate.

Healing Abilities: As stated by Horologium, he can cure the following: lack of oxygen, bug bites, chapping skin, itchiness and skin spots.

Automatic Danger Response Mode: Horologium forcefully summons himself when he detects a severe danger about to occur, and shields the person's body in himself. This was used to save Wendy Marvell from Hades's Katsu spell. It is also possible Horologium did this when he saved Lucy from being sucked up by the Anima.

Immense Durability: Horologium is shown to have immense durability as he is shown to have few scorch marks and burnt pieces on him after saving Arcadios from lava.

Immortality: As a Celestial Spirit, Horologium cannot die unless he is forced to stay in the Human World somehow.

Fairy Academy - Yankee-kun and Yankee-chan!
Horologium appears along with the Fairy Academy school staff during the assembly Carla called for after the brawl between the Fairy Academy and Courage Academy students. However, it is unclear what particular role he has with the staff.

Battles & Events

 * Natsu Dragneel, Lucy Heartfilia (owner), Gray Fullbuster, Erza Scarlet, Wendy Marvell & Laxus Dreyar vs. Hades

Trivia

 * Lucy's quote when summoning him is: "Open, the Gate of the Clock! Horologium!", as seen in the Chapter 2, when she first summons him.