Revamp the post-sol disaster round

[Boon Yoon]

Since the mob spam doesn't really matter all that much, what if it was turned into a spooky hardmode antag round (but with mobs)? I remember once people were given antagonist a little while after the fun began, and people like Cherry Fields starting screaming about how "she comes from the darkness" or something creepy like that while attacking with a knife.

Have a spooky thematic prompt, and maybe issue one antagonist at first, then a second a little while after, and so on, up to like five or some random number.