Then it remains the question, do you have underlying math, or are you just winging it?It's going to be ending up closer to Fighter 20/Barbarian 20 equals a Fighter 30 or Barbarian 30. I'm not designing this system around multiclassing. If this breaks multiclassing, it's not really a concern of mine at this point to break a variant rule that I have never played with. When I finish, I may provide a variant ruleset for leveling up in "epic levels" with multiclassing, but I'm not going to focus on that now.
Having underlying math can help align different epic classes easier than having to do N choose 2 comparisons.
It isn't trivial, and winging it is much easier.
I can give an example however. We can say that our level 30 character is equivalent to a Champion Fighter 20 Zealot Barbarian 20 half-orc overall (but only L 30, so +8 proficiency)
We'll modestly optimize; Great Weapon Mastery, Flametongue Greataxe, 24 strength, 24 constitution, 20 dex.
+8 proficiency, +7 strength, -5 GWM is +10 to hit.
Against an AC of 20 this hits on a 10+ for 80% accuracy 28% crit rate.
Hit is 1d12+2d6+17, or 30.5. Crit is 6d12+4d6+17, or +5d12+2d6 (39.5) over a normal hit. Zealot is another 1d6+10 per round.
13.5 from zealot; more likely it crits than it misses, but the crit is small, so we'll neglect it.
155.34 damage per action on AC 20.
Your HP are 6*20+7*20+40*7+5 or 545.
Your AC while naked is 22.
It took 8 ASIs to hit 24/24/20 in physical stats plus GWM. You have 3 ASIs remaining; resiliant at the very least. Maybe lucky.
You have 2 action surges. So your 3 round damage output vs AC 20 is 672.8 or 224 per round.
Your raw DPR is 216.5 with effective accuracy of +15; your crits are worth about another +7, as your critical hits are a bit more than double damage. Call it +22 to hit (effective).
Your AC is 22, but you grant advantage, so closer to 17. Your resistance to BPS is worth +50% HP or so.
Using (DPR*HP*(1+.1*(ATK+AC-13)))/5 we get this barbarian+fighter is "worth" about 84955 XP, or is a CR 25-26 creature.
Hmm, I forgot about GWF (fighting style), or the champions 2nd fighting style. That'd add a bit of damage. Not sure what to do with 2nd fighting style, given that the barbarian is naked.
A raw level 20 fighter with no subclass (!) in full plate using a flaming greatsword in +2 armor and shield (AC 24, 4d6+5(19) damage) is 76 damage per action, or 127 DPR. They have ~18 con for 204 HP. Their ATK is +6 (!) and AC is 24. Using the same math we get this fighter is worth 13990 XP, or between CR 15 and 16.
A subclass would help, maybe samurai to make up for the GWF inaccuracy or battlemaster. That might bump the CR by a point or two.
(Note that a better measure of PC-CR is to give them an adventuring day; without that, the Paladin and other "dump spell" builds get crazy. Here we used short rest resources only (other than healing)).
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