Authority

Authority is a core keyword that denotes that a unit has a leadership role over units of the same type. Because of this, other units of the same type gain a boost to their Influence and Willpower stats.

Card Text
Other units in play of the same type as [card name] gain +1/+1.

Usage in Decks
There are cards in all decks that have this ability.

Examples
Glen's plays Bor Lerich. Because Lerich has Authority and is of the Clavic Military and Greyback types, any other cards he has of those types gain a +1/+1 advantage while he is in play.