Stone Age Illithid Ideas

What might be some neat encounters a party might find within a devolved illithid hive? Backstory being the mindflayers within were experimenting with lycanthropy to create thrall soldiers that were extra durable. All that it left was a plague of wereboars in the countryside, a colony who've reverted to little more than tentacle ridden psionic neanderthals from eating tainted brains, and an elder brain that starved itself to death to avoid that fate.