This is an interesting and very valid question. It's easy enough to extrapolate the monk's unarmed strike damage and AC bonus, but is that legal/allowed? One of my PSOP characters is a level 14 monk, and I plan to continue playing him through the high level sanctioned modules. I will be in the same quandary when he reaches level 16.
There's some Info about what happens beyond 20th level on the PRD.
So there's some RAW about this.
Ah, thank you. For those who don't wanna click, here's what he's referring to.
Scaling Powers: Hit dice, base attack bonuses, and saving throws continue to increase at the same rate beyond 20th level, as appropriate for the class in question. Note that no character can have more than 4 attacks based on its base attack bonus. Note also that, before long, the difference between good saving throws and poor saving throws becomes awkwardly large—the further you get from 20th level, the more noticeable this difference grows, and for high-level characters, bolstering their poor saving throws should become increasingly important. Class abilities that have a set, increasing rate, such as a barbarian's damage reduction, a fighter's bonus feats and weapon training, a paladin's smite evil, or a rogue's sneak attack continue to progress at the appropriate rate.
So that gives some very reasonable justification for doing so.
On a completely unrelated note, why are there 4 posts, and my OP is number 4 instead of the first?
Edit: #5 now. Apparently it's shunted the OP under this post now.
It is in the GM's ballpark since the Pathfinder epic level suggestions in the Gamemastering section. Not hard to extrapolate, but nothing I think would help in PFS.
"Although Classes doesn't describe what happens after 20th level, this isn't to say that there are no resources available to you should you wish to continue your campaign on to 21st level and beyond"
Extrapolating the table, a 25th level monk would deal 4d6 damage on an unarmed strike and have a +6 AC modifier.
One of my PSOP characters is a level 14 monk, and I plan to continue playing him through the high level sanctioned modules. I will be in the same quandary when he reaches level 16.
No you won't. Neither would change from monk levels 21-24. Just look at the table, Unarmed Damage and AC bonus go up once every four levels.
I'd normally advise extreme caution against letting a normal magic item have much influence on or from epic levels, but monk abilities progress so meagerly it is a non issue. Kinda sad actually.