Talk:Item (Risk of Rain)/@comment-72.64.105.215-20140430040703/@comment-5127476-20140501031714

That would be the Enigma artifact. Enigma is itself a use item with a 45 second cooldown that when used gives you the effect of another, random, use item. But it's not aquireable like a normal item, so it doesn't show up in the Item listing ingame.