A first-person perspective was reintroduced in "Strange Journey", and incorporated into "IV"s battles along with navigable 3D environments. Each title focuses on the extraordinary invading the ordinary world, though the two main "Megami Tensei" series focus on different things: "Shin Megami Tensei" focuses more on the main protagonist gaining the power needed to survive in a world ruled over by tyrannical deities, while "Persona" focuses on interpersonal relationships and the psychology of a group of people. The protagonist is generally male within the "Shin Megami Tensei" titles: while a female lead or the ability to choose a lead's gender is not out of the question, some staff feel that "Shin Megami Tensei" lead roles are better suited to a male character. Throughout its lifetime, the series has incorporated elements of Gnosticism, various world mythologies and religions including Christianity and Buddhism, early science fiction, Jungian psychology and archetypes, occultism, punk, and cyberpunk. The science fiction and fantasy elements are brought together and unified through the use of philosophical concepts, enabling a blending of concepts and aesthetics that might normally clash. The stories of the core "Shin Megami Tensei" titles frequently include fighting against a tyrannical God. The method of story-telling in the series can involve traditional use of cutscenes and spoken dialogue ("Persona", "Digital Devil Saga"), or a text-based minimalist approach that places emphasis on atmosphere ("Nocturne"). A tradition within the core "Shin Megami Tensei" series is to focus on a single playable character as opposed to a group. Alongside other recurring characters is Lucifer, the fallen angel who stands against God and is portrayed in multiple forms to represent his omnipotence. Since "Megami Tensei II", the series has used a morality-based decision system, where the player's actions affect the outcome of the story. In "Megami Tensei II", the alignments were first defined as "Law" (the forces of God) and "Chaos" (the army of Lucifer). In future games, an additional "Neutral" route was included where the player could reject both sides. Selected games have been thematically or otherwise linked to a particular alignment. "Shin Megami Tensei II", due to events prior to the story, focuses on the "Law" alignment. For "Nocturne", all the characters were roughly aligned with "Chaos", which was done both to bring variety to the series and allow the development team more creative freedom.