Just wondering if the spell Banishment has a level cap on the level of mobs that you can Banish with it, similar to how "Banishment of Shadows" or "Disintegrate" does? Did a quick search around and couldn't find out if it did or not.
https://wiki.project1999.com/Banishment
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http://wiki.project1999.com/Banishment_of_Shadows
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https://wiki.project1999.com/Disintegrate