Formation Master Feat 13
Source Pathfinder Lost Omens: Character Guide
Prerequisites Formation Training
You can assemble a formation even with members of ancestries that lack the hobgoblins' military discipline, and you can extend these benefits to your hobgoblin allies. When you are adjacent to at least two humanoid allies, you gain the benefits of Formation Training, even if they aren't hobgoblin allies. Hobgoblin allies adjacent to you and at least one other hobgoblin ally also gain the bonuses from your Formation Training feat.
Traits
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.