How about the fourth class be Rogue Ghost. They deemed no one worthy to carry on with the Travelers Light so they poses a body for them selves to fight the Darkness. Powers would be tech based and electrically based. Just spit ballin' ideas here.
English
-
That seems more like an enemy type. Like they searched in the darkness for too long, became corrupted by it, and when they finally found a guardian and brought them back, the guardian was corrupted too.