Skill Summary - 3 is one of the three Skill Summaries in Arknights.
- A book that records advanced tactics. Can be used to upgrade Operator skills.
- It records high level skills needed by Operators. It takes a depth of experience in relevant fields to understand them.
The third of the Skill Summaries, this book contains detailed information about advanced combat skills and are needed for the advanced upgrades of Operators' skills and their Mastery training.
As seen on the table above, the best operation to farm Skill Summaries - 3 is CA-5.