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I red on their forum that Gloria Victis PvE raiding won't be in dungeons and won't be vs monsters but it will be assaults on camps or sieges vs castels. Finally something different from all the raiding and dungeon crawling in other mmorpgs! Dunno yet if it will be 5-6 man groups or 24-48 raids, but hope they will add both.
Can't wait to test it