Improved Elemental Heritage [Water]( Planar Handbook, p. 40)
You have manifested an even stronger tie to your elemental ancestor, resulting in a minor resistance to elemental effects.
Air Heritage (PlH) , Earth Heritage (PlH) , Fire Heritage (PlH) , or Water Heritage,
You gain resistance 5 to a specifi c type of energy, based on your elemental heritage: acid (earth), cold (water), electricity (air), orfire(fi re). You also gain a +2 bonus on saving throws against spells with the descriptor that matches your chosen elemental heritage (air, earth, fi re, or water).