Each subclass has an attribute that will give a hidden bonus to a specific stat.

Bladedancer
Better Control: Recovery +1
Fleet Footed: Agility +1

Defender
Increased Control: Agility +1
Untouchable: Armor +1

Gunslinger
Circle of Life: Armor +1
Over the Horizon: Recovery +1

Striker
Headstrong: Agility +1
Unstoppable: Armor +1

Sungsinger
Flameshield: Armor +1
Angel of Light: Agility +1

Voidwalker
Annihilate: Agility +1
Angry Magic: Armor +1