"Sanna is the heiress to the priest convent of Aurora. Her abilities as a cleric and warrior has garnered her respect amongst her elders and peers alike and was the reason she was chosen to be the successor of the convent."
Abilities: "Heal for an additional 1 Health"
^ this is according to the home page description.
Ability: "Heal for additional 1 Health as a Cleric in a Guild Battle"
^ this is according to when you have her selected on the general selection page.
She's great for clerics in Guild Wars. Guess this explains why they implemented the 10x effect.