I just beat that chapter this morning, FireEmperor. I hate Vigarde because you have no chance but to kill him with Ephraim, because Reginleif is the only weapon that can do substantial damage to him despite the fact that it tends to have about a 55% hit rate. Luckily I hit him once, missed him once, airlifted him out with Tana, healed him partially with L'Arachel, Tethys'D L'Arachel, healed Ephraim completely, and moved him back to Vigarde, where Vigarde damaged him, Ephraim missed once, then criticaled him with a 4% critical. I just got lucky, Vigarde is truly evil.