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Message: <blockquote data-quote="Celebrim" data-source="post: 9887424" data-attributes="member: 4937">Well, the answer to that is probably "Yes", in as much as for example the thief - especially the RAW one not revised by me - is gaining almost nothing by leveling and has true slow linear progression of power, so you'd expect his XP requirements to be more linearly increasing than quadratically increasing.  While in contrast a fighter has a fast increase in linear power, and a M-U has a quadratic one (more spells, each becoming more powerful, and more powerful ones becoming available as well).  So you'd expect their XP requirements to reflect that.But Gygax is also playing around importantly with the number of HD a class can obtain, and his general idea is that once you max out your HD, for all classes your XP needed becomes linear with weaker classes needing smaller linear XP and stronger ones greater linear XP.   And as a pattern, he wants to hit that linear XP total right around when you hit maximum HD.  And he's very much aware that the M-U is very squishy, but he wants NPC M-Us to be credible foes, so they need extra HD to not be too squishy.  So M-U get 11 HD to the fighter's 9 HD.  But that's a problem.  He doesn't want to give the fighter more HD, because they'd be not squishy enough.  So somehow he has to fit a class he knows needs greater XP requirements in such a way that by 11th level it needs only slightly more XP than the fighter needs to reach 9th level, while delaying the M-U spell progression by a level to slow their quadratic growth.I think the solution here is more extreme than the one I've adopted, and involves putting the M-U XP requirements into "tiers".  I ended up with two tiers (4th and under then above 4th) but probably 3 or even 4 tiers is required.</blockquote>

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