Energy Shielding
10th-Level Engineer Feature
Your armor gives you
resistance to one of the following kinds of damage,
chosen when you gain this ability: acid, cold, fire,
force, lightning, or thunder. You can choose to change
the kind of damage that you are protected from,
whenever you complete a short or long rest.
Upon reaching 14th level, any time you change
your energy shielding, you may choose two of the
above damage types to shield yourself from.