{
 "schema_version": 1,
 "generated": "2026-10-19",
 "id": "rehan-remade-universal-modder--add-custom-items-to-owned-game",
 "repo": "rehan-remade/universal-modder",
 "repo_url": "https://github.com/rehan-remade/universal-modder",
 "repo_slug": "rehan-remade-universal-modder",
 "title": "Add a custom weapon or boss to a game you own",
 "page_title": "How to add a custom weapon or boss to a game you own with universal-modder",
 "summary": "Describe a new item or boss in plain words and have the agent build it, with art, and test it in the running game.",
 "who": "Terraria player who wants a homing missile launcher and a custom boss but has never written a mod",
 "problem": "Writing a mod means learning the game's engine, code layout and asset formats before anything shows up on screen.",
 "outcome": "A working mod with generated sprites, tested in the real game, plus a recorded showcase clip.",
 "steps": [
  "Install the plugin for your agent, for example `/plugin marketplace add rehan-remade/universal-modder` then `/plugin install universal-modder@universal-modder` in Claude Code.",
  "Store your fal key with `um fal key set` and start your agent with FAL_KEY set.",
  "Tell the agent what to add, for example a homing missile launcher and a tactical nuke for Terraria, with sprites made by fal.",
  "Let it run the mod-any-game loop: recon, read the code, build one slice, generate assets, verify in game.",
  "Review the result and the showcase video it cuts."
 ],
 "agent_prompt": "Use universal-modder to mod <game name> installed at <path to game folder>: add <new item or boss>. Generate the art with fal, test it in the running game, and tell me which route and engine you used.",
 "agents": [
  "claude-code",
  "codex",
  "cursor",
  "gemini-cli",
  "any"
 ],
 "difficulty": "Beginner",
 "time": "1 hour",
 "basis": "field",
 "caveat": "Targets games you own, single-player or offline only. The README says it refuses to bypass anti-cheat or write multiplayer cheats.",
 "category": "Games & Hobbies",
 "tags": [
  "Games & Hobbies"
 ],
 "lang": "python",
 "requirements": [
  "A coding agent such as Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot or OpenCode",
  "A PC game you own, run single-player or offline",
  "Git, Python 3.10+ and ffmpeg (uv recommended)",
  "A fal API key for generated art, 3D and audio (or a local ComfyUI server for images)",
  "Blender for 3D to sprite renders",
  "Windows games run natively or from WSL"
 ],
 "risk": "dual-use",
 "seen_in_the_wild": true,
 "best": false,
 "score": 0.619,
 "evidence": [
  {
   "platform": "x",
   "url": "https://x.com/i/web/status/2110084405306011842",
   "posted": "2026-10-13"
  },
  {
   "platform": "reddit",
   "url": "https://www.reddit.com/r/ClaudeAI/comments/1wug3lx/new_opensource_project_tries_to_let_claude_code/",
   "posted": "1790800612"
  }
 ],
 "url": "https://dedupedai.com/use-cases/rehan-remade-universal-modder/add-custom-items-to-owned-game/",
 "md": "https://dedupedai.com/use-cases/rehan-remade-universal-modder/add-custom-items-to-owned-game/index.md",
 "disclaimer": "Deduped lists open-source repositories that belong to other people. We do not own, maintain, audit, or vouch for any of them, and a repo appearing here is not an endorsement or a safety check. The use cases, steps, and prompts are written by AI and may be incomplete, outdated, or just wrong. Where a use case is marked \"Seen in the wild\", we link to public posts where someone described something similar, but we have not verified those posts and the use case itself is still our AI's own write-up. Use all of this at your own risk. Only run code, commands, or agents on systems and accounts you are authorized to use, and read the code and every command before you run it, especially anything that touches credentials, files, or the network. Nothing here is professional, security, legal, or financial advice. All trademarks and project names belong to their respective owners, and their use here does not imply affiliation. Content is provided as is, without warranties of any kind. Found a mistake, a safety problem, or something you want removed? Email hello@dedupedai.com and we will look at it promptly."
}