Proficiencies are skillsets in Soulmask.
These are all leveled up by related actions for a given skill. For example, logging increases as one chops down trees.
Leveling up a profiency grants the character a choice of a buff reaching level 30, 60, 90, 120.
Every player has a starting cap of 60 (V0.2.0) for each profiencies, the tribesmen can have much higher maximum caps.