Proficiency

Rulebook

Proficiency measures your aptitude at a specific task. It has five ranks and gives a bonus added to AC, attack rolls, Perception, saving throws, skills, and spell effectiveness.

Untrained : +0 (no level bonus)

Trained : your level + 2

Expert : your level + 4

Master : your level + 6

Legendary : your level + 8

Untrained characters can still attempt many skill checks, but some activities require at least trained proficiency. Higher proficiency ranks also unlock access to skill feats and more powerful abilities.

RankBonus
Untrained+0
TrainedLevel + 2
ExpertLevel + 4
MasterLevel + 6
LegendaryLevel + 8

Player Core p.11. Proficiency bonus is added to AC, attacks, Perception, saves, skills, and spell DCs.