d4ca328e_f_the_Mists_FOTM_guide___Dulfy__Agony_attack_description
[Fractal] Underground Facility [Boss] Dredge Powersuit & Ice elemental [Agony attack description] 
Dredge Powersuit has a AoE stomps with a roomwide agony that can be avoided by dodging twice in a row or use special class specific skills (watch for the stability icon on the Powersuit as it will appear shortly before the agony stomp). Ice elemental have red circles with agony that can be avoided and seems all of his AoEs have agony with them. Just max range him.
GW2 Fractal of the Mists FOTM guide - Dulfy
Agony attack description