RPG Maker MZ - UNDERMAX - Stellar Spirits System is a plugin that adds a companion and growth system to games created in RPG Maker MZ. It lets developers design stellar spirits that players unlock, level, equip to actors, and use for passive effects while exploring maps.
Gameplay
The core loop centers on collecting and strengthening spirits that function as customizable companions. Developers define each spirit using actor data from the database, assigning custom names, biographies, faces, sprites, and unlock conditions tied to switches or events. Players interact with spirits through dedicated menus to allocate experience points earned from feeding specific items or standard battle gains.
Leveling follows either class-based curves or manual tables set in the plugin parameters. Each level grants points that players spend on traits pulled from state notetags, enabling stat boosts, immunities, or event-linked effects with adjustable costs. Spirits can be equipped to compatible party members, activating those passives immediately in gameplay.
Additional mechanics include evolutions that transform a spirit into a new one upon reaching a configured level, complete with custom animations and compatibility checks. Fusion combines multiple spirits under level and condition requirements, leading to a result screen and animation sequence. On the map, an invoked spirit appears near the party leader with floating movement, adjustable scale, offsets, and options to hide during vehicle use.
Game Modes
The plugin integrates into single-player RPG experiences built in RPG Maker MZ. It supports story-driven progression where spirits unlock through narrative events and provide ongoing utility via equipping and effect selection. Exploration benefits from the map companion display, which adds visual presence without altering core movement or battle rules.
Event commands allow precise control for cutscenes or quests, such as forcing equips, adding experience, or toggling menu access. This setup suits linear campaigns or open-world designs where companion growth ties into character development and resource management through feeding and point allocation.
Key Features and Customization
Extensive parameters control every aspect of the system. Developers configure UI windows for the main spirit scene, level-up feedback, effects, evolutions, fusion, and equip screens, including text strings, colors, sounds, and visual effects. Graphics, animations, and audio for feeding, leveling, and summoning are set per spirit.
Compatibility rules limit which actors can equip specific spirits, while passive effects generate dynamically from selected states. The system includes options for initial points, extra rewards at certain levels, and variable usage in sound effects for advanced scripting needs.
Is It Worth Playing?
This plugin targets creators working in RPG Maker MZ who want to expand their projects with a companion growth layer. It provides a self-contained system for spirits that evolve, fuse, and grant effects without requiring external scripts for basic functionality. Recent updates added spirit evolutions and a full experience mode build for testing.
Users report positive impressions in available comments, noting its usefulness for pet-like or mascot mechanics. The plugin works on PC through the RPG Maker MZ environment and supports commercial projects. It suits developers seeking configurable companion systems that integrate with events and menus rather than those looking for pre-built full games.
