You erupt in a fiery explosion when you connect with Bomb Style.
Prerequisites: Improved Unarmed Strike, Bomb Style, Bomb Strength, base attack bonus +10 or monk level 5th.
While in this style, when you strike a target with unarmed strikes while flanking, every 4th successful attack deals an explosion of fiery energy, dealing 5d6 points of fire damage to the target and all creatures (including the one using Explosion Fist) within a 15-ft.-radius, a Reflex save (DC 10 + half your character level + your Strength or Dexterity modifier, whichever is higher) for half damage. This is in addition to the damage the target takes from Bomb Style and is not multiplied on a critical hit. In addition, your fire resistance increases to 15.