Explanation of priority, found this in the Wiki:
npc_spells_entries
Entries in this table represent entries in spell sets defined in npc_spells. The spells in this list (and potentially a single parent list) will be loaded at spawn time, and sorted by increasing priority. Basically, the lowest priority value spell will always be chosen over a higher priority value spell. There is no garuntee which spell will be chosen if two of the same type of spell are set at the same priority, but only one will be used (currently).
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