Jsk Abilities

The Martial Ability Save DC
The Martial Ability Save DC is a flexible number determined by the highest of three ability scores: Strength, Dexterity, or Constitution. Whichever of these ability scores is the highest is your martial ability score. If two or more of these ability scores are equal in value, then you select which ability score is used for your Martial Ability Save DC whenever you finish a short or long rest.

Martial Ability Save DC = 8 + your proficiency bonus + your martial ability score modifier