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Message: <blockquote data-quote="Pyrex" data-source="post: 3162103" data-attributes="member: 11600">The cost listed in the PHB (for having NPC spellcasters cast spells with XP components) is 5gp per xp; but I'm not sure that's a great replacement factor.Case in point:  Limited WishLimited Wish obviously (imo anyway) doesn't deserve to be limited to being cast once per year.  A 1500gp material component is not only probably more prohibitive to casting it than the XP cost, it also significantly reduces it's use as a last-ditch rescue spell (when you really need it you may not have the component handy).How about something like the following: As far as crafting and XP costs are considered, give each caster a relatively small amount of XP as a buffer; say 50xp*Level.  This pool refreshes every level and any unused points are lost (so, for example, upon gaining level 13 and scribing Limited Wish into his spellbook, Bob the wizard has an XP buffer of 650).Thusly, Bob can cast Limited Wish twice and have 50xp left in his pool.When you draw more XP than the pool holds, it automatically refills and [something painful happens*].*not sure what this should be yet, something along the lines of a Negative Level that sticks around for a while before going away.</blockquote>