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Note, these are generated from at table, PbP playtests run with others, and single-player (me) encounter playtests, so far.
Characters and monsters will be linked when available.
Notes from 11/17/12: At table playtest with 4 players & myself as GM. Basic setup was to see how combat encounters would run, as well as to familiarize ourselves with Mythic creation rules.
Characters: All Level 17 PCs, with Mythic Tier 8. All Paizo books were available for use. Character Generation rules: 2d6+6 stats, no traits, standard wealth by level (410,000gp). (all played by experienced Pathfinder players, all of whom also have GM experience. About 4/6 of my regular tabletop group.)
Marion: Human Ranger 17/Champion Tier 8.
Bruce: (link pending) Human Two-Handed Fighter 17 / Champion Tier 8
Jiffy: (link pending) Gnome Paladin (unknown archetypes/oaths) 17 / Guardian Tier 8
Terrain: Open Desert, mid-day, no significant cover/terrain features. All characters "on foot" - no mounts/etc.
Creatures: 2 Great Wyrm Blue Dragons Each is CR 21, total CR for encounter = 23.
(NB: I goofed the first couple of rounds of encounters, forgetting that the 2nd dragon using his project image mirage ability was not really there. Fighter took some minor damage which I ret-conned shortly after.)
In the beginning, both dragons gain surprise rounds (since the party was travelling across the desert completely in the open with no regard for stealth/camouflage at all). Using their keen vision, invisibility spells, and project image occasionally, both dragons buff up with the following spells:
Greater Heroism, Stoneskin, Bull's Strength, Cat's Grace, False Life, Ant Haul, Mage Armor, Shield. Each casts quickened haste during their surprise round, then the Mirage Dragon (real dragon sitting comfortably far away on a convenient rock mound/dune) pops up and breaks his vanish by breathing on Bruce & Jiffy. Both fail their saves and take a bunch of electricity damage.
Jiffy & Malik buff a bit, sharing around protection from energy, heals, and try to dispel the image, but failing.
Real Dragon comes closer, using his storm-breath power to pull down a bolt on Bruce, who fails, again. This time, it hurts a lot less since he's protected.
This proceeds apace, with the image dragon using spells (finger of death especially) but failing to do very much, in between his breath weapon attacks (much more effective in the long run).
Healing and buffs get spread around, with some ineffective attacks used on the approaching Real Dragon while he's burrowing through the sand.
As he gets close enough, he throws up an acid fog and then quickened dimension door's behind it. It's time to get our teeth & claws dirty!
Bruce (now Large and with a couple other buffs on him), flies over to engage, getting bit for some minor damage. He whiffs on all but one attack (not expecting an AC of 61, I believe), still dealing some 173 damage (Two-Handed Fighter + Mythic Power Attack + Auto-Confirmed Crits = OUCH!).
The real dragon, realizing his danger, quickens a blink before trying to tear Bruce's face off. He whiffs on all but the Bite & 1 Wing (very high AC on our beat-stick, as well!). Meanwhile, Mirage Dragon continues to harass the others, calling down lightning, casting more finger of deaths and quickening some low-level spells.
Bruce is unable to do much with the blinking Real Dragon, whiffing for a full round (rolled like 3 crits, but each one was negated by the miss chance), until Malik managed to land a mythic dispel magic to strip the blink (as well as his shield spell) away.
After that, it was a fairly simple Tank & Spank on out. Bruce landed another single attack for some 177 damage, before Marion finally managed to land a few good blows (on the new, much easier to hit AC 57), driving off the Real Dragon (running away via quickened dimension door) once and for all.
The Mirage Dragon went away shortly thereafter to another mythic dispel.
All told, the fight took about 90 minutes, and about 7-8 rounds, total.
Impressions: A Mythic Dragon would probably have been a better encounter, since it could bypass the Guardian's DR, do MUCH more damage with his breath weapon (still did QUITE a lot on the poor-reflex Bruce), and have a few extra tricks up his sleeve. Great Wyrm Blue's are tricky enough, as is, though. Even to the point where I goofed using the wrong one to deal melee damage early on.
Mythic Champions are QUITE the Beat-Stick. Move + Full Attack + Mythic Power Attack is extremely deadly, especially if the fighter has Reach from something. Two-Handed Fighter is still the king of melee damage, apparently.
Archmages & Hierophants who DON'T take "Endless Power" from Tier 6 on are really losing out. Turning 1st-3rd level spells into cantrips, effectively is extremely powerful (especially with things like resist energy, see invisibility, fly, and other relatively short-duration, awesome spells.
Paladins are still the kings of saves, and when you factor in Mythic Saves & Guardian defensive tricks, it becomes extremely hard to hurt them.
Almost no-one used their Amazing Initiative in this fight, surprisingly enough.
Conclusion: Each PC really did feel "Mythic" in their capabilities, much more so than a standard party of adventurers would have. They were capable of surviving a pair of CR 21's who really should have been capable of tearing at least one of them apart. No-one (other than Bruce the Fighter) really took SIGNIFICANT damage, and even then Bruce was able to be patched up by the healing Paladin fairly easily.