Moon Spire

Players enter a tower lobby through a portal built from yellow concrete frames and ignited with flint and steel, then plan a route across a tower map of battle rooms and campfire rooms. Tower health and a run-specific deck carry from room to room, so each run is a separate progression.

Combat is turn-based: cards, energy, statuses and enemy intents work together, so every turn asks for decisions about resources, timing and target priority. Challenged creatures fight from battle decks, and other players can join in synchronized multiplayer battles. Card Forge converts equipment and Minecraft items into playable cards for the deck cycle.

The mod includes tooling for people who build packs or run servers. After enabling developer mode, pressing F8 opens an in-game editor for card faces, monster data and battle UI layout, and the data is stored in a moonspire folder under the version root directory. Moon Spire requires NeoForge and is published for 1.21.1 only; the environment is client and server, so the server and every player need it. JEI is also used for item lookup. The code is under the Apache License 2.0 and open source.