If you use a mod like Skyrim Unbound or Alternate Start - Live Another Life (or if you just want to avoid the main quest), the dragon priest mask Nahkriin is unobtainable. This changes that.
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The dragon priest mask Nahkriin is only obtainable in a location that Odahviing takes you to during the main quest. But you might want to collect all the dragon priest masks, even if you use a mod that let's you avoid the main quest, or if you just don't want to do the main quest for the 47th time (the Nahkriin encounter is even towards the very end of the quest line). So this mod places his mask somewhere else in the world. I won't say where, but I can promise you that it's a location where it makes sense for a dragon priest mask to be found.
Note: This mod does NOT remove Nahkriin from his original location, so if you play through the main quest, AND find the mask in the location this mod provides, you'll end up with two of an item that is supposed to be unique.