Proficiency bonus is a measure of how a character's skill level affectsBack to Help
their rolls. It serves as a modifier to most skill rolls.
Formula:
= skill_level / 20 + 2
Example:
For 50 starfighters:
= 50 / 20 + 2
= 2.5 + 2 # round 2.5 down to 2!
= 4