The Arknights base Training Room facility is required for upgrading operator skills to Mastery Rank (beyond level 7).
How it Works
- First upgrade your operator of choice to Elite 2 with Skill Level 7.
- Ensure you have Training Room Built and upgraded to the relevant level eg. Mastery Rank III requires Training Room Lv. 3 (Training Room is located on level B3 of your base. It can be built once Control Center 4.0 is achieved).
- Pick skill you wish to upgrade.
- Obtain necessary Elite Materials.
- Assign relevant Trainer to speed up specialization time (optional).
Unlike with Skill Levels 1-7, you will need to individually upgrade your operator skills to Mastery Rank. So pick your upgrade carefully.