Board Thread:Speculation House/@comment-34633327-20170712152648/@comment-26397825-20171026125212

Possibly the one Salem told to reinforce the numbers at Beacon in V4 when she was talking to the Seer? Someone over in the Ep 2 discussion thread suggested that she may have been talking to someone similar to how she was talking to Watts and Lionheart.

If that is the case, then I speculate that in V6 they'll find the Beacon Vault and Cinder will open it to get the Relic (if she's still alive, which I don't doubt she will be).