For the hot blood series the highest level spell (cast by the highest level necromancer) takes priority.
For the disease line they all stack. I forgot how/whether the poison line stacks. My inkling is they do?
If working with another necromancer you need to coordinate your spells with each other - you can't stack the same spell cast by multiple casters. E.g. if 5 necromancers cast disease cloud on a mob, only one copy of the spell will stick (the one cast by the highest level necromancer, which overwrites/blocks previous/future lower level casts).
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