...Holy S'pht!
I don't normally read the fanfics people post here because usually I'm bored to death by fan fiction of any sort, but this... I actually only read this by accident, but wow...
The writing is far from perfect but the concept is amazing! I love it! Psychological stories are perhaps my favorite genre. I'd love to see this expanded upon: detail the entire six (make it seven, seven's a nicer number) years since Mazzarin's ressurection, he begins in complete amnesia, a slave to his master's will, but then slowly he regains his memories and begins to realize who he is, finally breaking almost entirely from The Watcher's grasp at the end.
As you recall the Shade Mazzarin on the level "The Watcher" is already severely damaged when he teleports in and has no Dispersal Dreams. Some theorize this is because Mazzarin inside is still struggling to aid the Light. So say at the end, right before that battle, he breaks against The Watcher's control and assaults a large part of his army - which explains why there are so few enemies there, what with it being THE WATCHER and all, you'd think there'd be a larger army. In the battle he is severely wounded and wastes all of his Dreams, but The Watcher finally managed to regain control of him and forces him to come to his aid. But still he struggles against, fights poorly, and in the end lies there dying, as the Berserks charge up the bluffs and shatter The Watcher... and finally, he is free.
I would tell three stories in this at once: the details of Mazzarin's campaigns under The Watcher, the psychological story of his struggle against his control, and the recovered memories of Mazzarin the Great, realizing who he finally is as he recalls his final defeat by The Watcher.
Do it, do it! I'll help with conceptualization, make sure you get all your facts write. I would love to see this done!