Any spell that is usable Post Kunark by a class but not usable by them now will have a level 255. Its just whatever the programming uses to identify a item that at one time is usuable by that class but not at current time. Yes to make it more classic those should be removed though but it also works the other way around like on live spells like invigor and invigorate have a req level 255 to mem if you had the spell in your spellbook because it was removed from the game when stamina was changed to endurance.
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