OOC - Magical Lore Proposition: Soul-Power, Necromancy, and Vampirism

I've been thinking about some of the magic mechanics that have been described by various players, and I thought I'd propose some of the ideas I had regarding magic and how it could work. This should be super-generalized and should hopefully not conflict with anyone else's ideas, but if something doesn't work out, I'd like to discuss it in the comments section so that we can establish a coherent magic system.

Anyway, so my idea was that magic is powered by an entity's soul. In most cases, a practitioner of magic will use their own soul-power to cast a spell, but this is not universally the case. Some races cannot access their own soul-power, and instead have to use the souls of animals, plants, other people, or even spirits to utilize magic. Using magic does not necessarily consume a soul, rather, it just temporarily drains it, although certain magics probably do consume souls.

Necromancy is largely the magic of soul manipulation. Necromancers can access the soul-power of the dead, and either use that power to animate corpses, power their own spells, bring a soul back to the mortal plane in a host body, and perhaps a bunch of other things.

Vampires, when they consume the blood of the living, also consume their meal's soul, which empowers them and grants them their immortality and super-human physical prowess.

Anyway, I'd be interested to hear your guys thoughts on this propostion.