Spirits Plus for Aground is a free utility mod designed for Windows that expands gameplay by introducing elemental spirit familiars and new quests. Players can interact with the Alchemist to unlock new items and areas after defeating spirits. If the Alchemist is unavailable, an alternative questline from the Exiled offers a chance to acquire everything needed to progress. The mod also features the Spirit Net for capturing various elemental spirits in their basic forms, enriching the player's experience with new gameplay mechanics.

The mod includes the Spirit Distillery for generating elemental gems from captured spirits, allowing for flexible storage options with over 200 available slots. Additional features such as the Spirit Maze provide unique exploration opportunities with procedurally generated environments. Players can also utilize various enhancements like pendants, shields, and tools for improved gameplay. Overall, Spirits Plus offers a variety of new content that enhances the Aground experience.