If the Deadeye, Tundra, or War Archer spellbooks still appear to use their default stats from the main Archers Expansion, the balancing data pack may be disabled or overridden by another pack.
Checking Active Status with Commands
1. Enter your world with cheats enabled. In a survival singleplayer world without cheats, open the pause menu, click Open to LAN, toggle Allow Cheats: ON, and start the LAN world.
2. Open chat and enter /datapack list enabled to view every data pack currently active.
3. Check the chat output for the Archers Expansion balancing data pack. If it is missing, run /datapack list available to confirm Minecraft recognizes the file in your datapacks folder.
4. Enable it directly from chat by typing /datapack enable followed by the pack's listed name.
Fixing Override Conflicts
Data packs loaded later take priority over earlier ones. If the base Archers Expansion data is overriding your balance tweaks, run /datapack enable with the last keyword for the balancing pack so its changes win any conflicts. Run /reload afterward, then inspect the Deadeye, Tundra, and War Archer spellbooks again to confirm their adjusted Prominence II stats are active.