With the Old Power, Caiera is capable of increasing her physical strength and other impressive feats. The Old Power made her a key figure among the Shadow People, as only some actually had access to it.
Here's how Hulk and Caeira met. It was upon discovering Red King's villainous nature, she helped the Hulk rebel against him and later agreed to become the Hulk’s wife. Later on, she lost her life when Galactus arrived to consume her world.