Fiery Grip is a skill located in the Ardent Flame (which can be found in the Dragonknight skill tree). Fiery Grip is a base skill, and can be morphed into Empowering Chains or Unrelenting Grip.
Fiery Grip deals the following types of damage: Flame Damage. Which means that it gets buffed by the following blue champion point trees: Elemental Expert, Elf Born, Master at Arms, Spell Erosion. Also the following red champion point trees protect against this skill: Elemental Defender, Iron Clad.