Killing the giant blood stone in the area far north in Luculla Forest, past one of the three paths of immaculates/demons/lava. That closes the portal that is causing the meteors to rain, which allows you to continue unlocking the homestead (current stones consumed still add to the progression, it's just delayed until you solve this problem).
You need a tenebrium weapon (or void damage enchanted weapon I think?) to kill the blood stone. You will likely have to sneak past some invulnerable minions to get to it, even if you go through the immaculates.
