Zombie Plague spell

[Whitewings]

I've been thinking about this, and so far, I have this much: Necromantic, Special, VH. Duration: Permanent. Prerequisites: Mass Zombie, Rotting Death, Magery 3. Cost: More than Mass Zombie

This spell creates a horde of zombies that can infect others with a supernatural sickness that turns them into infectious zombies; a successful bite attack inflicts the disease, with effects equivalent to the Rotting Death spell. Those slain become zombies, as per the spell.

Further development is needed, and I'd appreciate feedback and commentary. I know the spell isn't as nasty as most zombie plagues; this is intentional.