@Schema(description = "The axioms of this spell", minItems = 1, maxItems = 2)
    private final Set<Axiom> axioms;

    @Schema(description = "Notes to this spell.", minItems = 0)
    private final Set<String> notes;

    @Schema(description = "Infos to this spell.", minItems = 0)
    private final Set<String> info;

    @Schema(description = "Prerequisites for obtaining the spell", minItems = 0)
    private final Set<Prerequisites> prerequisites;

    @Schema(description = "Possible attack (most spells are treated as attack to use the CharSheet for rolling).", minItems = 0)
    private final Set<Attack> attack;

    @Schema(description = "Possible armor (some spells provide armor depending on success levels).", minItems = 0)
    private final Set<Armor> armor;
}