Hellknight Dedication Feat 6

You gain expert proficiency in Intimidation (or in another skill in which you're trained of your choice if you were already an expert in Intimidation). You become trained in light armor and medium armor. If you already were trained in light armor and medium armor, you gain training in heavy armor as well. Whenever you gain a class feature that grants you expert or greater proficiency in any type of armor (but not unarmored defense), you also gain that proficiency in the armor types granted to you by this feat. You gain the armor specialization effects of that armor and one additional armor upgrade. Your resistance (or reduction from critical hits) from that armor's specialization is 1 higher than normal and you gain an item bonus to Intimidation checks equal to 1 + your armor's resilience value.