d4ca328e_f_the_Mists_FOTM_guide___Dulfy__Agony_attack_description
[Fractal] Volcanic Fractal [Boss] Legendary Grawl Shaman [Agony attack description] 
Agony is applied to the arrow he shoots at random group members. This can be either dodged or blocked with projectile reflections. This arrow will often miss as you are constantly moving anyways during this fight.
GW2 Fractal of the Mists FOTM guide - Dulfy
Agony attack description