GM lost sectors would be good. Make them drop exotic weapons or armour whether it has its own special exotics or raid exotics. ALL lost sectors should be SOLO to get any exotic.
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Well first off there's no gm Los sectors and you have to play them solo to get exotics, but yes the drop rates are really to low. 10 to 12 runs and it's always a year one exotic ..never a piece your looking for