Agdayne's Set

Agdayne's Set can be aquired by speaking to Agdayne in the undead crypt after defeating Velstadt and aquiring the King's Ring. Along with his armor set he will give you Darkdrift.

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Agdayne can be found in the undead crypt surrounded by non hostile grave wardens. He will tell you not to produce light so do not light a torch in the area or he will become hostile.

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Furthermore you can aquire the greatsword he wields as well if you trade the old dead one soul with ornifex.