Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding Stats SkillProperties CanBackstab

AlwaysBackstab is basically synonymous with "This is a dagger skill".

A great example of CanBackstab is Flurry. If you have daggers, this can backstab, but it's not exclusive to daggers.