Credibility is one of the three stats of the Dungeons and Discourse universe, along with charisma and conviction commonly referred to as CRE. It correlates to power over the material and feats of physicalism, such as showcases of strength or, say, causing things to burst into flame, all require a roll to be made, and CRE is added to these rolls to determine the level of their success. Knowledge of the world as it exists in it's natural state is also solely a Credible domain. If you want to know what Kierkegaard said about subjectivity and truth, or the meaning of Planck's constant, ask a Credible. In combat, CRE can augment the damage you do with any given attack. Every points in CRE means you do an extra HP of damage with your basic attack.