Myth of the Rose Knight, the first and hopefully only Wyld Exalt.
Thinking of Mythic Exalts - if they're powered by and have power over stories
and, in a sense,
become stories, as the name "Myth of the Rose Knight" suggests, then this may have interesting implications.
Power over stories could let them call upon stories. Other mythic exalts, especially high-level ones, being stories, could thus be called upon. And since they also get power
from stories, this could let said called-upon mythic exalts strengthen the calling mythic exalt(s). And since stories only fully die when no one remembers them, they'll all be around forever (in a sense) as long as just one of them always survives to keep the stories of the rest alive in their heart.
There would be no such thing as "facing a single mythic exalt" and they could munchkin up cycles of escalating empowerment that let them take down
anything as long as a) at least one exists and b) at least one other has existed before. And even if they were all killed, you'd have to destroy
all memory of
every single one of them just to be sure they wouldn't spring up again.
This is horribly OP and therefor (based on my admittedly third-hand, fanfic-derived knowledge) fits right in with the Exalted setting.