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So I was looking through Battlecry! and reading through the Field Propagandist archetype. I was sort of mentally choosing between the 6th level feats Invented Vulnerability and Invincible Army, and I noticed there was no duration listed in the feat description.
You enumerate the many virtues and victories of your chosen allies, creating a story of their invincibility so convincing that it is as good as the truth. Choose an ally you can see and attempt a Deception or Diplomacy check against the hard DC for the target's level. On a success, the target gains resistance 5 to either bludgeoning, piercing, or slashing damage, chosen when you use this ability; the type of damage resisted is usually tied to the story you tell about the character, such as giving them piercing resistance after telling a story about the time they rushed through a rain of arrows to take on an enemy encampment.
You can instead attempt your check against a very hard DC for the target's level to give them resistance to two damage types, adding acid, fire, cold, electricity, and sonic to the damage types you can grant resistance to.
I couldn't find an errata for Battlecry! either. Invented Vulnerability lasts for 1 round, so since they're comparable abilities, it feels like it should be the same, but I was wondering if there was an official answer to my question as to the duration of the ability, because without one, in theory, you could give your whole party resistance 5 to like to 8 damage types just forever which just seems a tiny bit broken.