Elemental Adaptation

The ability to cast spells of the element you wish to choose. This Feat cannot be taken twice.

Exposure to elements connected to the ethereal has warped your physical body irreversibly. You have become immune to one of the mystical energies that often flow through you, however the elemental taint has cursed you with vulnerability to its counterpoint. Select one element matching a spell you can currently cast. Choosing an element will provide you immunity to that type of damage and vulnerability to an opposite element on the table below:

Element	Opposite
Fire	Cold
Lightning	Thunder
Radiant	Necrotic
Force	Psychic
Poison	Acid

Additionally, Being hit by an element you're immune to heals you for half the damage. This feat cannot be selected again at any point in the character's life, and the vulnerability of the selected element cannot be reduced unless a spell or effect would completely negate the damage taken.