Reactive Alchemy

Players combine Powers and materials in the world and watch the results, with numerous arcane tricks and techniques producing useful effects and items. A set of custom-made blocks can be given custom names, and players discover new reactions by testing them. The Journal guides players through the rest of the mod, and its pages are written in the style of an alchemist's notes from three different narrators. Some content is hidden until a player runs a particular experiment, so secrets are revealed through play rather than explained outright.

Reactive Alchemy requires Patchouli, which provides the guide book. The mod is largely data-driven, so developers can add new Reactions and Power kinds with datapacks, or with KubeJS and Json Things packs. Some features differ from world to world and can be adjusted through config options. Files exist for Forge and NeoForge for 1.18.2 – 1.21.1, and the mod runs on client and server, so both the server and every player need it. The code is released under the Creative Commons Attribution Non Commercial 4.0 license and is not open source.