Blackmoor in the Stone Age!

[Freedom92]

Also what Immortals were of elemental origins? They probably be common in a stone age setting as nomadic tribes try to find new stomping grounds though what immortals are active then anyways?

From the Mystara, WL, or WoB point of view?

Interesting enough from all point of views would be good, I dont know much about the wilderlands besides its gone through many post apocalypse senarios including the Pious vs. the Philosophers, the Makrab coming with their demon slaves(would love more info on this one), and the war of the dragonlords so it would be interesting what gods were around. Also since you take wilderlands into account would you toss psionics in as a option? Though I'm curious how the gods of the wilderlands connect to the Immortals, etc.

Also maybe evolved reptilian races?

In my campaign, I have the Sar-Aigu, and the Snakemen of Thracia, the later being 1-1 copies from Robert E. Howard's Shadow Kingdom.
Also, as my players can woefully recount, the Caverns of Thracia are located in Blackmoor in my version.

So, we could sure build on that.

Interesting and very likely, the Ar-Aigu are interesting and the fact I've always played them as true deep ones in fun. I love how you can easily place lovecraftian elements within. So they could have shock troopers made from brutal stock of sea creatures/.

Primary races: Homo Sapiens, First Men, Dragonkin, Snakemen, Sair-Aigu, Fey (proto-elves).
Elemental gods, oral magic.

Mining?

What of Neanderthals? Would they already have been whisked away or near extinction?

Elemental gods and maybe more chaotic, demonic, entropic Immortals? I still dont know which ones would be active during this time period but the elemental 'gods' would be strong influences.

Mining would be interesting, have one group of homo sapiens who live in a mountainous region where magic is a dead zone so they go into finding ways to combat the powers of other tribes, so they dip into a vein of ore and go about mining with crude picks so they advance a new level for weapons.