At the end of the mid-season finale of season 2, we see
a man without eyes who has his own copy of the Obelisk, which glows when Skye and Raina place their Obelisk in the temple.
Who is the man?
Its more than likely that the man with no eyes is "Reader", an inhuman character who is blind but has the ability to make anything he 'reads' become real.
He is a very powerful figure in the Inhumans canon, and the Inhumans themselves blinded him because he was perceived to be too powerful.
As S02E11 Aftershocks of Marvel's Agents of S.H.I.E.L.D. revealed that the eyeless guy
is an Inhuman who has power of teleportation. His Inhuman name hasn't been revealed yet, but he was called Gordon in flashback.