So far I can confirm that :
-Limbus is affected (did Apollyon SW)
-Salvage is not affected
-Windurst ANNM with Gnat is affected
-TW mobs outside any instanced area are not affected
-Mobs from the latest WoTG windurst quest "The Long March North" are affected
-Spiders from Aht Urghan (right outside WG) are not affected.
Haven't tested the rest yet (usually i nuke before half duration hits).
Also a GM confirmed this, working as intended.

(and *** typo on title, areas not ares lol, if a mod can edit it :o) :x