I find it frustrating sometimes to be in a fight and then, when I get my party fairly well positioned and at a safe distance to some of the more deadly missile attacks, then all of a sudden the game takes me "out of fight mode" and repositions my characters all together and within inches of the enemy. That plus the game then lays in with some devastating moves because my turn has been forfeit! Grrr.
That aside, any hints for defeating the Prime Sentinel and its amazingly super-powerful unstable servants?