Sight

The Sight is an ability which allows one to see prophetic visions of the future. Prophet Velen's gift of Sight warned him of the dangers of joining Sargeras. Granted a vision by a naaru called K'ure, Velen led his people off Argus. The sight to visions can also be induced by an extract made by alchemists.

Several Zandalari trolls have the Sight as well. Known examples are Zul and Vol'jamba, though The Dark Prophet Zul says Zul is simply "one of" the dark prophets, implying the existence of more than one or two dark prophets.

Speculation
Noticing how similar the description is, it is possible that the spiritual sight used by the blind Drek'Thar, granting him prophetic dreams and visions, could be the Sight.