What CR would you consider this Mythic group?

[CannibalKitten]

Im having trouble figuring out what CR encounters are appropriate for them. Now i understand Mythic really dosent offer the most balance so im not really looking for a hard ruling unless there is one. Suggestions would be nice, heres the party:
Brawler/Ninja lv15 Mythic 3
Wizard lv15 Mythic 3
Wizard lv13 Mythic 2
Wizard lv13 mythic 2
Skald/witch lv15 mythic 3
Warpriest lv15 mythic 3
Rogue lv15 mythic 3
Hunter lv15 mythic 3

[Sangerine]

Add half your MR (round down I believe) for CR.
So in order of posting.

CR: 16
CR: 16
CR: 14
CR: 14
CR: 16
CR: 16
CR: 16
CR: 16

CR(group): ~20-21. Equivalent CR of three CR 18s and one CR 16, or one 20, one 18, one 16.

Realistic answer? CR is awful at estimating strength of PCs, especially when mythic is involved. Actual power level depends highly on the builds of the PCs, gear, environment of the scenario, etc.

[Chromantic Durgon <3]

Further expanding on what Sangerine said, the difference between what the Archmage mythic path can give compared to what some others can give such as Guardian is a very broad gulf.
Even between wizards there could be huge gaps so I suggest its unlikely you'll be able to challenge everyone with the same encounter, some characters liable to find things suddenly very testing whilst others are still feeling OP

it might be worth talking to your group about what they want to fight.

[CannibalKitten]

Thank you, ive never fully relied on CR and have found it nearly useless with this particular party. Its the largest ice played so i thought CR would be more helpful. Not sure if the mythic offset it horribly or if CR is just that inaccurate. Mostly i was looking for a baseline to see if things i want are way past what should be fair.

[captain yesterday]

Mythic offsets CR that much.

[CannibalKitten]

Its a very heavily story driven game, ive literally emptied the first bestiary of demons on then at various group makeups as well as a few daemons as they are currently in the abyss. I always thought demons everywhere would be alot scarier then they make it seem lol. Im losing a few players soon so the group will shrink as too will my problem i think(all the wizards are leaving!! Hallelujah! Lol) but as of now im contemplating some lesser demon lords and such to test them a bit more?

[Mark Carlson 255]

IMHO, the CR system works best at lower levels and at higher levels is less effective so the GM has to take it more upon themselves to balance encounters.
MDC