Spatula said:High-level CRs are not very accurate IMO. I think the numbers are generally few levels too high, but aside from that it's hard to enforce the gradual-attrition assumption of the EL model.
Well, that's what the books assume you're facing at those levels.
So, the core books assumes that a wizard ( or, more in general, a spellcaster ) can kill a monster that should be a challenge for the entire party 3/4 times /day in 1 round, 45-55% of the time, and still have enough spell slots to make the whole group invisible, fly all day long, knock a couple of locks just in case there isn't a rogue, Poly into something nasty in case he's stuck in melee...I can go on, but I think I've made myself clear.
That's why you hear people saying that RAW, spellcasters are not balanced, at all.
Now, you can say that those numbers are not appropriate, and "fix them" using higher level monsters. That's fine, but isn't it an admission that yes, spellcasters are indeed unbalanced?
A CR 20 dragon against a party without a caster is overkill, or at least a hard fight; against a party with a properly optimized spellcaster it is, usually, a pushover.
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