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Anyway I got a berserker ring by combining an inferno ring with blizzard ring.Again bad luck ,I was ...
Not that I know of something but one time I combined an inferno ring with a lightning and I got a dark ring. I haven't tried it again so I cant confirm. I got a total of 4 dark rings from the game. I combine it with lightning to get berserker ring to complete the set. 3 of D-rings came from 100 soul draws. Shop is easiest to get one.
By the way that is the best inferno ring that I have seen so far. So many boosted stats. This is what's left of my dark rings.