Defeating the Dark God is tricky, especially when he has three forms. When you are facing the knight attached to the god, use a high level Summoner or undead Summoner with strong summons. You should also use Eiji and her Long Shot moves and Vallens and Ursula. Have Eiji stay back and use Long Shot. Have the Summoners use their strongest summons and have Ursula and Vallens attack the knights. You will eventually win. In the face section of the battle, the faces summon undead cats and wolves. It helps if you have Ursula equip the Deaths Head weapon. Also use combos and you might inflict instant death. Keep attacking the heads with Ursula and you will win. The dragon is very difficult. Use Eiji's Long Shot attack and have a Summoner summon strong summons. Do not attempt to get close or you will suffer an instant death bite attack from the dragon. Use long range fighters (Gungirs, Archers, and Summoners). If you have Eiji at level fifteen and have a strong bow, you will win quickly.