Here is one of the newest images from the upcoming Races of First Ones: Aneishi. Here is a little history of the Aneishi:
Though considered First Ones by the humanoids of Exodus and driven into exile with their masters, the Aneishi ally with the Exodites and the Brotherhood of Khayne only for the sake of mutual fears and hatreds. They are wild cards among the First Ones, a savage people neither slaves nor citizens of the dark demesne but vital to its success. Though the kobura subrace of sobeka were likely created in an attempt to obsolete the Aneishi, these spider-like humanoids remain indispensable to their allies.