Shield Warden (Fighter) Feat 6
Source Pathfinder Core Rulebook
Prerequisites shield block
You use your shield to protect your allies as well as yourself. When you have a shield raised, you can use your Shield Block reaction when an attack is made against an ally adjacent to you. If you do, the shield prevents that ally from taking damage instead of preventing you from taking damage, following the normal rules for Shield Block.
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.
ChampionThis indicates abilities from the champion class.
FighterThis indicates abilities from the fighter class.