--- Assassin 39-s Creed — Origins Save Game Level 30 Codex
No official “Codex” item exists—so it’s probably player slang for:
Ubisoft Connect will automatically overwrite your new save with your old cloud save if you don't disable synchronization. Go to Settings > Downloads > Enable Cloud Save Synchronization for supported games (Uncheck this).
Ubisoft’s stance on save game sharing for Assassin’s Creed Origins is neutral. They do not ban players for using custom saves in single-player mode. Since there is no PvP arena (the arena is versus AI), Leaderboards are largely ignored by the community. --- Assassin 39-s Creed Origins Save Game Level 30 Codex
However, using a Level 30 Codex save will disable Steam Achievements if you are offline. To re-enable achievements:
Our Verdict: It is not cheating; it is time management. Assassin’s Creed Origins is a 60-hour game. A Level 30 Codex save reduces that to a 20-hour highlight reel. Ubisoft Connect will automatically overwrite your new save
If you just want a Level 30 boost with Codex progress:
Most sought-after Level 30 Codex saves are not just about the XP. They are about the Legendary Loot. A typical high-quality save file will include: Our Verdict: It is not cheating; it is time management
Important Note: If the "Codex" save file is from a cracked version that had the Pre-order DLC unlocked, you will also have the Ambush at Sea mission (unlocking the "Tangled Sail" ship decoration) and the Horde Mode in the Arena.
If you want boosted stats but feel guilty about using a pre-made save, consider these official alternatives: