Primordial Resilience

You undergo a ritual that protects you against elemental attacks.  You gain the following benefits.

• Increase your Constitution score by 1, up to a maximum of 20.
• When you finish a long rest, you gain a pool of points equal to your level.  When you take cold, fire, lightning, or thunder damage, you can expend points from this pool to ignore an equal amount of that damage.  This does not take a reaction.  If this reduces the damage to 0, you do not suffer any secondary effects of the spell or effect such as Ray of Frost's movement reduction.
• You are comfortable in temperatures ranging from -50 to 150 degrees Fahrenheit.