That is the purpose. You have to equip both rings to gain the aura. 2 different auras would be overpowered, IMORTB said:I don't get it. You get the same aura twice when you have two Rings equipped.
Edit: Combining Diablo and Meph rings you get 20% to Lightning skill Damage and lvl1 Resist Lightning aura. The same with the other 2 possibilities, but with the other elemental skills.