Possibly the Burrowers (a bit like the Egg of Coot) have various grades of "awakwness" and Keres woke them up to a decent (but not full) grade, then they slowly went back to "sleep" across few centuries.
If it was a war of conquest of Keres + Burrowers + Qullans against "the rest of the world", it would have been pretty short (no more than few years, not centuries for sure), unless the rest of the word has comparable weapons and strength...

Possibly Khoronus action started the "proper" Burrowers wars as a war with all Burrowers (awake) on Keres' side would have been extremely short (who could resist him?).
Possibly the centuries long war was the subsequent, with all Burrowers having their armies (Egg of Coot style, after all) and using them against one another.

I'd expect the immortals intervening directly in this kind of situation only if there was a Burrower gradually "winning" over other ones and trying tp "unify" them under its command.
Maybe unified Burrowers can potentially summon Outer Beings? :idea:
THAT would be a good reason to intervene directly on the Prime plane and with the approval of (more or less) all the other immortals...

Sounds good :wink:



BTW, if you have a look at this FanGazzetteer of Hyboria: (sorry, it's in Italian 8) ...and looks awesome 8) ) at page 7 you'll find that, on year 662 Before Crowning, a huge monster of colossal dimensions (as big as a mountain) briefly came out of a major crevass, before going back "to sleep", never to be seen again.
The monster was called Ufloq by the few surviving witnesses' tribes and its description could definitely match that of a Burrower.

Could this be of interest for you? I'm not sure about where this detail has been taken from, but looks like to me that all the material in this FanGazzetteer is derived from either canon or fanon sources...

This way the Qullans would be still enrolled as a Burrower's troop (the Egg of Coot)? Faithful for so many millennia?
However, if I remember properly, the Egg doesn't trust them excessively... not exactly the picture of faithful troops, on its side... the rebellious blood of Keres?