For people coming back from ds3, ds2 online matching is based on soul memory. Every foe you kill, you gain soul memory increased. If a guy keeps playing the game for 300hrs, he/she can never be matched online with another guy for 100hrs. So the ring is a kind of hotfix, it puts stop for obtaining further soul memory. Most PvP players use this ring when they are at Level 150-200 for skill play.