So the Saurus warriors once went out en masse and exterminated the creatures deemed Anathema to the Old One's plan. Clearly the failed abysmally to exterminate the Beastmen and greenskins. The Skaven emerged after the purge. The completely dead races are obviously unknown, but the Fimir are different. They are mostly dead and eking out their dwindling generations on the edge of civilization far from the Temple Cities of the First Children of the Old Ones. They are humanoid reptilian with Cold blooded psychology and a strong magical aptitude. They have a fondness for being reclusive in wet places. They want to erode the barriers between the physical world and the Chaos Realms to regain the favor of the Dark Gods whereas the Slann want to strengthen said barriers. That's too much common ground to ignore. Not every enemy of the Forces of Order needs to attack with endless hordes. Sometimes the badguys are the underdog. While they can't challenge Lustria or the Southlands, surely they harbor dreams of revenge. Lizardmen traveling the Old World may be at a disadvantage to their ancient foes. Scheming underdogs fight a lot more differently than ravening hordes. Also, the Fimir can legitimately see themselves as victims. Their rightful place was destroyed by the usurping Liizardmen created by the so-called Old Ones. That gives them a desperation and tenacity not seen in the other Forces of Destruction who tend to be motivated by blood lust or arrogance. Is there any official GW fluff on these guys outside the short descriptions Storm of Magic and Monstrous Arcanum books? This is a fluff angle I'd like to explore.