Damage
= 2.1844 * TotalSpellPower * TotalPetDamageMultiplier
if SubSpec = PriestDiscipline and ArtifactRanks > 0
= Damage * (1 + 0.005 * (ArtifactRanks + 6))

http://www.askmrrobot.com/wow/theory...on=7_1_5_23420