Krueger the Stormwrath

On the round in which Kruegar pops his feat and deploys the AOEs, they count as magic attacks. For subsequent rounds, they are simply damaging effects, and not magic attacks.

From the FAQ:

Erratum: Primal p.107 : Storm Ravager: Replace with the following: Place three 3" AOEs anywhere completely within Krueger's control area. Target each enemy model in one or more of the AOEs with a magic attack ignoring Camouflage, concealment, cover, elevation, Invisibility, LOS, screening, and Stealth. Models hit suffer simultaneous POW 10 damage rolls. At the beginning of each of Krueger’s controller’s Maintenance Phases, Storm Ravager AOEs not completely within Krueger’s control area expire. Krueger's controller then removes one of the Storm Ravager AOEs from the table. He may then move the remaining AOEs in his control area up to 6". AOEs must end this movement completely within Krueger’s control area. Enemy models touched by one or more moving AOEs suffer simultaneous unboostable POW 10 damage rolls after all the AOEs have moved. An enemy model entering into or ending its activation in one or more Storm Ravager AOEs suffers an unboostable POW 10 damage roll. An enemy warbeast in one or more AOEs during its controller's Maintenance Phase must pass a threshold check or frenzy. If Krueger is destroyed or removed from play, the AOEs immediately expire.