if you mean the (Green) Eternal Set affix (1-6), there are 2 items with this set, so you could get Eternal (2). if you have an item with + set affix (Legend-Red) you could have Eternal (2-6). the + set affix has a cap of 4, so if you had Eternal Nadroji Ring and Necklace, they would have +4 each for +8, but with the cap, only +4 will benefit you, and the other +4 will be wasted. to get the (6) you would need both Eternal items with the Eternal Set, and +4 Set affix, for 6 total. hmm, I think there is a ring and necklace with Eternal set too, so it could go to +8 total. also, the Eternal set can't be rolled with Crystals, it can only be found on items you get from looting monsters and breakables.