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Warframe: Sortie Mission Guide - Metadragon.de
Right next to raids and fashionframe, Sortie missions (or Sorties) are currently considered as the “endgame” of Warframe. The developers underline that fact by making a level 30 frame and the “War Within” quest a prerequisite to access Sorties. At the moment this means you have to reach Mastery Rank 5 at the very least. …