Eventually, I hope to put a lot more expansion material for Mystara's wondrous worlds of Humanoids on this page, but for right now, I just have these couple of pieces.
Articles
Foul Thouls: Presenting a horrific abomination unique to Mystara.
The Great Crater: The Gazetteer of this monster infested portion of the Principalities of Glantri.
Time of My (So-Called) Humanoid Life: The Complete (yet not completely canonical) Timeline of Mystaran humanoids.