Now, Reiger indeed possessed strength comparable to that of Lv.5.
Although he was only Lv.4 now, he had previously leveled up three times, each with full abilities rated as SSS, which made his potential much higher than that of the average adventurer.
Before leveling up, others could at most hone one or two of their abilities to stage B, and very few could reach stage A, let alone stage S. Only prodigies like Ais, Bert, Theona, and Theone, who achieved Lv.5 status at a young age, might manage to enhance their preferred abilities to stage S.
For example, Rephia's potential was acknowledged as Revilia's successor. She had firepower comparable to Lv.5 when she was only Lv.3 largely because she had honed her "Magic Power" to stage S before leveling up.