Lusus

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Lusus naturae, (shorthand Lusus, plural Lusii, also referred to as custodians), are animals who look after young trolls, fulfilling the role of a typical parental figure. Lusii are either naturally occurring, or artificially reduplicated by Corporate. Artificial lusii often take on more of the traditional caretaker role, while a relationship with a natural lusus tends to be more symbiotic in nature.

Lusii are naturally blackblooded, changing to match the blood color of their charge after a bond is formed. A lusus' eyes fill in with this color as well.

Aspect Holder Lusii

Cooperi attacking.

Cooperi

First Appearance

Cooperi, also called Coop, is Sova's lusus. Cooperi is part of the Stryx family, a type of owl-like lusii valued for their feathers. Cooperi could be seen helping in defeating homunculi before Sova entered the Medium. Cooperi was left behind on Repiton as she couldn't fit through the entry portal. Despite this, Sova has promised Cooperi they'll see each other again.

Dismas' lusus.

Skulltitan lusus

First Appearance

Dismas' lusus. An abusive Skulltitan lusus whom Dismas frequently gets into fights with. This lusus is strong enough to leave notable scars on his charge. He kidnapped Dismas when he was young, and forced him to mine for radioactive ore to feed him.

Awakened from below Repiton's crust by Jentha's nuclear energy, this lusus was the runt of his litter. As the lusus fed off of the nuclear energy to be more strong, he was sent to the dunes alongside Dismas using Space alchemy. While the lusus was supposed to be put down (if when found, a lusus bond with Dismas hasn't formed), due to the fact both of them were never found, he managed to survive.

He was ripped apart by Weird Al after being possessed by the Denizen of Mind in order to activate Dismas' portal.

As a species, Skulltitans are large lizard-like lusii and similar to the pop culture icon Godzilla by size and abilities. The lusii seem to carry significance in culture on Repiton, being mentioned as early as page 8 as a comparison of a large, destructive creature and having several movies and merchandise based off of them . They're hard to kill without any proper technology.

Arcjec's lusus, agitated.

Opossum lusus

First Appearance

Arcjec's lusus. Much isn't known about him. When Ellsee visits Arcjec's destroyed hive, she finds the opossum lusus, devastated and worried about Arcjec.

Jentha's lusus first meeting her.

A cocooned metamorphier on a building.

Metamorphier lusus

First Appearance

Jentha's lusus. A large caterpillar-like creature that is exceptionally long. They spun themself a cocoon shortly after meeting Jentha, and have not emerged since.

It's said that the evolution of Metamorphiers depends on what their ward requires, breaking from their cocoon when they're deemed needed. It's not clear how accurate this is to the species.

Chimera lusus.

Chimeraparent

First Appearance

Chimeraparent is Ellsee's and Zekura's lusus. While called Chimeraparent as a singular being, they are a chimera lusus with multiple heads and are called by the plural term of lusii. The leonine head is named Ari, the gazelle head is named Ayala, and the serpent head is named Nachash.

Chimeraparent is one of the few lusii who are known to be able to speak, with each head having a different typing style in their speech dialogue. Ari's dialogue is proper usage of uppercase letters and always ends lines with a period, Ayala's dialogue is full lowercase always ending in exclamation marks and Nachash's dialogue is proper uppercase letters with each sentence ending in a line of periods.

Presumably alive since Zekura was, as they were in the shadows while The Executive was walking through his hometown.

Guardianspirit.

Guardianspirit

First Appearance

Guardianspirit, also referred to as the Star Guardian, was Albion's lusus. Presumably given only to the Star Children, and only able to manifest in the Cell.

Guardianspirit is one of the few lusii who are known to be able to speak. Their typing style in dialogue is full lowercase letters with asterisks: six asterisks before a line and five asterisks with a dash at the end of one.

After fulfilling their promise to Cyprim -- deceiving Albion in order to unlock her rage -- they faded away entirely.

Lefty greeting Serpaz.

Lefty

First Appearance

Lefty was Serpaz's lusus, a Compecado lusus with the ability to suck negative emotions out of Serpaz.

She was dissolved into doom essence after being sacrificed by Weird Al to activate Edolon's Doom powers.

We see multiple Compecado lusii as Edolon leads Lefty to Weird Al , meaning the species as a whole carried meaning to activate the Doom abilities.

A pack of wild Compecado lusii can be seen in [S] Ellsee: Enter. during Ellsee's entry as she entered the Northern Wastes, revealing themselves from behind piles of snow to swarm her.

Laivan's lusus, Mutt.

Mutt

First Appearance

Mutt is Laivan's lusus and is the only artificial lusus out of the main cast. Mutt entered the Medium with Laivan.

Occeus' Ouworm lusus.

Ouworm lusus

First Appearance

Occeus' lusus.

Taz's Minkmom.

Minkmom

First Appearance

Minkmom was Taz's lusus. The two seem to have had a somewhat testy relationship.

She was devoured by the mutated Lusii of the Black Depths, revealing Taz's entry codes.

Murrit's lusus on his deathbed.

Neomacrodon Lusus

First Appearance

Murrit's lusus. He dies for an unknown reason.

Calder's lusus.

Anglerfish Lusus

First Appearance

Calder's lusus.

It is implied that Calder first bonded with a male anglerfish lusus; when it went on to mate, it attached itself to the body of a female anglerfish lusus, as per the parabiotic reproductive process of some anglerfish species. The female anglerfish now acts as Calder's surrogate lusus.

Other Lusii

Cattle Lusus

Sahvel's lusus. It helped out on the village set in Thaumatrope: Haustoria with carrying materials before passing away.

Crocodile Lusus

Yeshin's lusus. They are implied to have an abusive relationship with their charge, since they are responsible for Yeshin's limp.

Mecera and her lusus.

Hornet Lusus

Mecera's lusus. It might be able to produce some kind of substance, as the only time we see this lusus is when Mecera stirs some goop in a pot.

Hummingbird Moth Lusus

Secily's lusus. YVES' design is based on them.

Moose Lusus

Gerbat's lusus. It was previously the lusus of Alcest, but after his passing, went on to take care of Gerbat instead.

A fully pupated mosquito lusus.

Mosquito Lusus

Lutzia's lusus. They spend most of Lutzia's earlier life in a larval state, only pupating when Lutzia is about to enter adulthood. After their pupation, they are tall and strong enough to allow Lutzia to fly with them. A similar mosquito lusus can be seen in [S] Murrit: REW/FFD. during Alt!Murrit's segment.

Platycat

Crytum's lusus. Crytum didn't have a lusus growing up, but got Platycat as an emotional support lusus after moving to Stronghold 21.

Ro-Man

Ro-Man is Rypite's lusus. He is a lusus who appears in Thaumatrope, and is based on Ro-Man Extension XJ-2. Ro-Man was an actor and film star before being a lusus. Wether Ro-Man is a biological creature or an animatronic of sorts isn't clear.

Sheep Lusii

Pramen's lusii. These lusii are a unique case of multiple lusii of the same species acting as a group of custodians for one troll. They seem to be rather clueless, eating anything they can latch their teeth onto.

Snail Lusus

Helica's lusus. It's implied that the slime Helica sells was made by her lusus in some way. The lusus was discovered to be dead at the end of Thaumatrope: Haustoria.

Sphinx Lusus

Sirage's lusus. It shows little to no care for Sirage, such as leaving for prolonged periods of time and often gets in the way of Sirage within her hive.

Weasel Lusus

Margol's lusus. Margol met him after saving her from a venomous snake. Margol's lusus attacked Mecera after Margol was affected by Mecera's survival ability of venom nails and promptly dying. After Margol's death, the weasel lusus was taken care of by Gerbat.