Digiheads are the primary form of enemies the Go-Home Club will encounter throughout the course of the story. They are people that take the form of corrupted monsters due to their dependency on Mobius and Redo. They are often depicted as fanatics of μ or Regret, as well as the Ostinato and Obbligato Musicians, and react violently to anyone in opposition of those they idolize.
People who enter Mobius have some form of emotional trauma or phobia that led them to escape reality. As they continue to spend time in Mobius and listen to μ's songs, they gradually become dependent on μ and her music in order to suppress their negativity in a manner not too dissimilar to actual drug addiction. When dependency reaches a critical point, that person can sometimes turn into a monster known as a Digihead. There are currently two known methods for people to become Digiheads
Violent emotional turmoil, if not regulated, can cause a person to become a Digihead and run berserk. If properly regulated through a mix of outside assistance and personal resolve, this can instead achieve the Catharsis Effect
When the Ostinato Musicians play μ's songs over the various audio mediums of Mobius, they can convert addicted individuals into Digiheads and more or less aggravate them in order to attack "rogues" and "laggards" that threaten Mobius' stability, such as the Go-Home Club.
There is a strain of particularly rough μ addicts that are labeled Egoheads. An online board in Mobius exists to track these people's identities, as they're known to be troublemakers even to other μ fans.
Digiheads first show up after the protagonist attempts to escape Mobius and ends up interrupting one of μ's concerts. Several of the concert's audience turn into Digiheads and attempt to pursue the protagonist, only for him to be rescued by Shogo. When the protagonist awakens to their Catharsis Effect, they handily defeat the Digiheads. From then on, Digiheads become the generic enemy encounters throughout the game, wandering the scenery of Mobius and attacking the Go-Home Club whenever they get near.
The various interactive NPCs in the game have a gauge measuring from 0 to 99%, representing the person's "Erosion Rate", or their dependence on Mobius for mental stability. Starting at 50%, NPCs will become Digiheads and attack the player, even if they previously performed conversations or sidequests. NPCs in proximity to battles may suffer spikes in Erosion Rate, turning them into Digiheads on the spot. NPCs that turn into Digiheads cannot be interacted with for sidequests or Causality Link purposes. Erosion Rate also passively raises over time, especially in dungeons where μ's songs are playing. Erosion Rates reduce to safe levels when the NPC is defeated.
Generic Digiheads may have a name like "Lost Soul" and an extremely high Erosion Rate.
Some Digiheads actively seal away memory fragments with their presence, and must be defeated to release them.
Generic students recruited for the party utilize Digihead powers and abilities to fight in battle. However, they cannot gain any EXP because they do not retain the memories of their time as a Digihead.
Digiheads do not particularly change from Caligula Effect to Overdose. However, when Lucid is wandering about Mobius, they may come across Laggards (humans who are aware of Mobius but cannot achieve a Catharsis Effect), who display Digihead-like transformations and abilities. There is no gameplay difference, but Lucid and the Musicians are ordered to hunt down Laggards to maintain the stability of Mobius.
Ritsu Shikishima is originally unable to perceive Digiheads, being another blissfully ignorant inhabitant of Mobius. What is actually a clash between a Catharsis Effect-wielding Shogo Satake and a mob of Digiheads merely looks like a schoolyard brawl to him. However, as he begins to notice inconsistencies within Mobius, he gradually becomes aware of the existence of Digiheads merged with the ordinary populace, even being chased by several during the school's opening ceremony.
Later on in the anime, Digiheads are barely even present as a threat or impediment to the Go-Home Club, as the focus is mainly on interactions and clashes between the GHC and the Musicians, as well as μ's mental degeneration.
Caligula Effect 2
Digiheads return once more in The Caligula Effect 2. Unlike previous installments in the series, Digiheads will now aggro and chase the party if they are within the monster's line of sight. Additionally, unlike the previous titles, defeating an enemy will not only lower their Erosion Rate, but also allow the party to immediately speak with them after they have temporarily regained their sanity.
Digiheads bear a variety of names, but generally follow the format of an adjective followed by a noun. The adjective determines the specific enemy type of the Digihead, while the noun determines the overworld model of the NPC. Nouns typically consist of words such as clerk, student, and worker and can be found throughout the world of Redo. The term "phantom," however, is exclusive to the Towers of Epimetheus and Prometheus.
Acerbic Digiheads have long, arachnid-like appendages protruding from their backs.
|Anti-Effect||Support||Increases ATK and decreases Cast Time.|
|Bind Web||Action||Decrease EVA.|
|Full Crisis||Attack||Melee attack.|
|Venom Sting||Attack||Melee chain attack triggered by Bind Web.|
|Virus Shot||Attack||Melee attack that inflicts poison, decreases max HP and HP recovery.|
Bashful Digiheads have a metal, pyramid-shaped head with several metallic wings attached to their backs. They primarily perform defensive actions — specifically constructing Emergency Barriers to defend themselves.
|Deflect||Action||Creates an Emergency Barrier.|
|Desperado||Attack||Melee chain attack triggered by attacking an enemy with Emergency Barrier active.|
|Hollow Valor||Attack||Melee that inflicts DEF down.|
|Sphere Phalanx||Action||Creates an Emergency Barrier.|
|Soul Shout||Support||Increase DEF.|
Chatty Digiheads have three large modern speakers all across its body. They primarily cast ranged attacks they debuff the party.
|Hallucination Noise||Action||Decrease ACC.|
|Slag Tone||Attack||Ranged attack that increases Cast Time.|
|Spreading Apathy||Attack||Ranged attack that nullifies buffs.|
Dreamful Digiheads have a large set of metallic wings on their backsides, and four circular metal bolts attached to the sides of their heads.
|Call for Back-up|
|Fairy Powder||Support||Heals, increases EVA, and reduces Cast Time for all allies.|
|Minefield||Attack||Lays about 5 bombs on the ground in a cone formation.|
Gloomy Digiheads have two large phonograph speakers attached to the sides of their heads. They primarily perform ranged attacks.
|Call for Backup||Action|
|Death Metal||Support||Increases DEF.|
|Grieving Voice||Attack||Ranged attack.|
|Healing Aura||Support||Heals an ally.|
Soulless Digiheads have several neon pink crystals piercing their abdomens. They primarily perform melee attacks.
|Bloody Hands||Attack||Melee attack that inflicts Bleed.|
|Brutal Screw||Support||Increase ATK.|
|Over the Break|
|Poison Edge||Attack||Melee attack that inflicts Poison.|
|Sensation||Support||Increases ATK and decreases Cast Time.|
|War Cry||Attack||A Melee skill that increases ATK.|
|Wave Cannon||Attack||Ranged attack.|
Violent Digiheads have several tentacle-like tendrils writhing behind them.
|Brutal Screw||Attack||Melee Attack that reduces CRIT.|