Expertise A Expertise A Lv. 4

You become familiar with A-Grade equipment.

Expertise D Expertise D Lv. 1 You become familiar with D-grade equipment.
Expertise C Expertise C Lv. 2 You become familiar with C-Grade equipment.
Expertise B Expertise B Lv. 3 You become familiar with B-Grade equipment.
Expertise A Expertise A Lv. 4 [selected] You become familiar with A-Grade equipment.
Expertise S Expertise S Lv. 5 You become familiar with S-Grade equipment.