the transcendent IS in sync, the only Pegasus fighter in the entire campaign. he has already been to the universe and back because of some experiment.
however the use of the sync device in his vicinity (you don't see him but he is there, come on, HE'S THE JUGGERNAUT BITCH) gave him manipulation over reality in the same AOE as sync. however after refining the effects, his ability became so powerful that he could no longer control it and had 2 split personalities 1: tried to recreate the sync and reverse the polarities to undo everything 2: tried to get someone to kill him 3: wanted to take over the galaxy and-then-some (the out-of-control ability of course)
greatest accomplishment: traveling to the end of the universe (they got awesome fish too bad it costs 42 fuckin bucks)
greatest failure: sync drive going bonkers and fucking up everyone's MYND