Lighthouse Monster

The "Lighthouse Gem Monster" is a corrupted Topaz gem that first appeared in "Horror Club". It is notable for causing the lighthouse to appear possessed.


It consists of a gigantic mouth grown on the wall with Lars' name on it.


It was corrupted gem trapped inside of the Lighthouse wall, until one day a young Lars carve his name into the house which caused it great pain. As a result the lighthouse came to life and started to attack Lars.

Years later in the present the Lighthouse had became Ronaldo's Beach City Horror Club. After Lars, Sadie, Ronaldo, and Steven had watched a scary movie things in the lighthouse started to come to life and Sadie was kidnapped. The guys went down into the basement where they found Sadie and a giant mouth over Lars' named. Ronaldo tried feeding Lars to the monster but Steven saved Lars with his bubble which causes the monster to get destroyed. Once Steven picks up it's gem it shows a vision of the past, back when Lars and Ronaldo wear kids. After the vision ended Steven understood why the monster attacked. Ronaldo wanted to look at the gem but Steven stated they should let it rest and bubbles back to the temple.


  • Possession: It has the ability to possess, although it is unknown if this ability is limited to inorganic or non-living matter.
  • Host Body Manipulation: While possessing the lighthouse, it was able to manipulate different parts of the building, like forming flesh-like matter and a mouth on the basement wall.
  • Partial Possession: It has many paranormal-like abilities, such as possession of inanimate objects like scarecrows and fake bats, meaning it is not limited to only the light house but nearby objects or items touching it.
  • Telekinesis: It carries the power of telekinesis, which is shown when it was able to levitate and throw objects inside the lighthouse.
  • Memory Projection: It has the ability to project recordings of past events it has witnessed, just like Pearl, this also bears a resemblance to Lapis Lazuli's photographic memory-like ability to replay past events as seen in the episode "Mirror Gem".
  • Hologram Projections: The Lighthouse Gem Monster can project holograms like an uncorrupted Gem, with enough skill to create accurate "playbacks" of past events from memory.



Lighthouse Gem Monster's gemstone doesn't have a known physical location.


  • It is capable of projecting recordings of events that it has witnessed, similar to Pearl's ability to project holograms, and Lapis Lazuli's ability to records events she has witnessed through the mirror she was trapped in. It is the first (and so far only) Gem monster to demonstrate this ability.
  • It is the first Gem monster to possess the ability to talk. However, its speech is faint and disorientated.
  • It is the first Gem monster to target a specific individual, with Lars being that individual.
  • It is questionable if it is corrupted as it hasn't been seen using a form. However, the big mouth might have been its form, which would explain the mouth poofing.


           Steven Universe Villains

Great Diamond Authority | White Diamond | Yellow Diamond | Blue Diamond | Pink Diamond | Homeworld Gems | Peridot | Lapis Lazuli | Jasper | Yellow Diamond's Pearl | Blue Diamond's Pearl | Eyeball Ruby | Navy Ruby | Holly Blue Agate | Aquamarine | Topaz | Emerald | Robonoids | Fusion Gems | Sugilite | Malachite | Unknown Quartz Fusion | Gem Monsters | Centipeetle Mother | Gem Cave Creature | Big Bird | Watermelon Tourmaline | Ice Monster | Invisible Gem Monster | Lighthouse Gem Monster | Slinker | Great North Gem Monsters | Cluster | Bismuth | Marty | Frybo

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