Dawnbreaker is a skill located in the Fighters Guild (which can be found in the Guild skill tree). Dawnbreaker is an ultimate. Dawnbreaker is a base skill, and can be morphed into Flawless Dawnbreaker
or Dawnbreaker of Smiting
Dawnbreaker deals the following types of damage: Physical Damage. Which means that it gets buffed by the following blue champion point trees: Master at Arms, Mighty, Piercing, Precise Strikes, Thaumaturge. Also the following red champion point trees protect against this skill: Hardy, Iron Clad, Thick Skinned.