randomkingcrab
Villager
Thank you everybody for your insights. It does seem like it would take some extra efforts to mix them and trying to balance it out (wouldn't be impossible tho) but so far leaning toward just using the Immortal Handbook and tweak a few things to be more compatible with the whole thing, mythic monsters should be fine to use but will probably just keep it on some creatures to be rare oddities in the setting and not have players with Mythic ranks themselves. I like the setup and works well with some epic worldbuilding.