Super Zero wrote:
All proficiency bonuses work exactly the same way.
No bonus if you're not proficient, 2 + your level if you're Trained, 4 + your level if you're an Expert, 6 + your level if you're a Master, and 8 + your level if you're Legendary.
Most classes start out Trained in their class DC, but spellcasters get Trained in spells and spell DC instead. Classes that don't get class DC proficiency also won't have any features or feats that call for it (though it can interact awkwardly with some other feats and archetypes).
Like all proficiency, class DC will increase with your level. It also gets periodic bumps from your class features as you level up like most things.
I get that they work the same, Ijust don't know where to find the class proficiency and when it actually increases to master and beyond.