Two silver bands with flowing elven script etched along its surface saying 'Wiith my blood drained my love shall share in kind'. A Warm steady beat emenates from the band when worn on two seperate creatures.
When two creatures attune to this item, those two creatures share any damage or healing taken and is divided equally between the two regardless of distance. Also, if one where to fall to the effect of a spell the other fails as well and falls to the effects without a save. In addition you know exactly the location of the other creature attuned to the band if they are on the same plane. If the other creature is brought unconscious, dead or are on a seperate plane of existance the bands return mundane, once either of these are remedied and the attuned creature is still wearing the band, the effect returns.