Project Moon games are HEAVY DARK GAMES, very notably rated for their extreme mature themes - they're NOT for kids! Vergilius is an inhabitant of the dark world of The City in all its atrocities and these themes come up a lot in his backstory of Leviathan and the story of Limbus Company. The company has released an official content warning list as follows:

Child death and experimentation
Animal cruelty
Drug use
References to alcohol and tobacco
Injury and dismemberment
Homicide and suicide
Violence and torture
Cannibalism
Kidnapping, abduction, and captivity
Psychosis
Diseases, seizure, and dyspnoea
Familial homicide and domestic violence
Reference to clowns (coulrophobia)
Themes of occultism and spiritualism
Audiovisual depictions of gore
Uses of sharp and pointed objects
Hospital and medical references
References to gaslighting and bullying
Body modification and/or deformation
Strong language and demeaning words
Reference to traffic accidents
Uses of guns and instruments of violence
Discriminatory violence
Religious torture and violence
Enforced ideology and/or actions
War and mass conflict

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