Elemental Infused

Elemental Infused, Mutation Perk
This entity has fused to their associated element, and has taken on some of its qualities as a result. Any elemental damage of that element heals them instead. All their spells with that element as their main component are twice as strong and have half the casting cost and time. All elemental damage of the opposite element deals twice the damage. All their spells with the opposite element as their main component are half as strong and have double the casting time and cost.

Reference
Chapter 107 "Come Together"(Slinger)