2 levels, 1 point per level
A bane makes the character exceptionally vulnerable to an otherwise harmless substance, such as holy water or sunlight or silver, which causes physical damage and possibly secondary physical effects like welts or boils. If your character has additional banes, add 1 point for each.
Level One: The bane causes minor damage: 10 points by touch or 2 points by presence, depending on its nature.
Level Two: The bane causes major damage: 30 points by touch or 6 points by presence, depending on its nature.