The GameplayAbilities API allows you to associate a set of attributes, that is, UAttributeSet, to an Actor. UAttributeSet describes properties appropriate for that Actor's in-game attributes, such as Hp, Mana, Speed, Armor, AttackDamage, and so on. You can either define a single game-wide set of attributes common to all Actors, or several different sets of attributes appropriate for the different classes of actors.