Bosses and Demon's Souls
Demon's Souls refer to the souls of named bosses that you receive when they are defeated. When you defeat each boss, it would be in your best interest to not consume its soul if it is your first time playing through the game. Demon's Souls can be used by Blacksmith Ed to make unique weapons or by Sage Freke, Yuria, the Witch, or Saint Urbain to teach you Magic Spells and Miracles. Blacksmith Ed must also be given the Red Hot Demon's Soul before he can upgrade weapons with other Demon's Souls.
How Soul Form and Body Form Affect Boss FightsEdit
Ultimately, how difficult each boss fight is for your character is mostly dependent on your equipment (Weapons and Armor), your spells (Magic and Miracles), your tactics, (head-on assault, hit and run, etc.) and your skill. In body form, you have full health with the ability to wear two rings while in soul form you may inflict a bit more damage. Clearly, it's also dependent on which boss you fight and how you fight it.
A Note on Blue Phantoms in Boss FightsEdit
The more phantoms you have aiding you in your boss fight (maximum of 2), the more HP the boss will have. This means nothing, however, if your blue phantoms are decent damage dealers and stay alive for the duration of the battle. For even more Demon's Souls, visit the End Game and Colorless Demon's Souls pages.