> For the complete documentation index, see [llms.txt](https://ecio-space.gitbook.io/ecio-white-paper/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ecio-space.gitbook.io/ecio-white-paper/game-characters/character-guide/ranking-system.md).

# Ranking System

All types of Space Warriors can be upgraded to a maximum of 5 levels. Upgrading in each level requires 3 NFT Cards of the same type of unit to perform a genetic transplant. All 3 units will be destroyed after the process is complete. The success rate of each upgrade depends on the level of the upgrade by a total of 5 levels which are:

1. **Crewman** – A fundamental ranking for every Space Warrior.
2. **Lieutenant** – The second Ranking, upgrade bonus stats in every aspect with a 60%  success rate.
3. **Commander** – The third Ranking, significantly upgrade bonus stats in every aspect with a 30% success rate.
4. **Captain** – The fourth Ranking, notably upgrade the fighting stats with a 20% success rate.
5. **Admiral** – The highest Ranking, with the bonus of the supreme commander which is almost invincible with a 10% success rate.