It be interesting to see the old dark aura node mechanics come back through fractures. Turning the biome surrounding it into Eerie, while also spawning Furious Zombies (and maybe rarely Eldritch Guardians too but commonly in the Emptiness) every once in awhile. I think that would also make it easier to tell if there's one nearby.

I would like the eerie biome to come back, so you could actually make them yourself using the biome changer later on. Also furious zombies would be nice to see again so I support this.