Hammer of the Righteous is a paladin ability learned at level 20 for those with either the Protection or Retribution specialization. It allows paladins to strike a target, but then have a wave of holy damage sweep over all other targets within range while generating a charge of holy power.
It attacks the paladin's current target with a straight melee physical attack, doing a percentage of weapon damage.
If the physical attack connects with its target, it then attacks all nearby enemies (including the paladin's target) with a Holy damage spell. This is resolved as a spell attack, using the paladin's spell miss chance.