Ooh, I love Calamity Mod! Just about any time I ever go back to Terraria, it's almost always with Calamity installed, I've played it that way so many times in my life that it's pretty much become the new vanilla to me lol.

I will say though, I don't know if I've ever noticed Hive Mind being harder on the surface as opposed to the underground, unless that's like something from a newer update (considering I've not played through in about a year now lol).

Either way, great mod, and it's kind of become a term of it's own to me lol. As in, to call something a "Calamity Mod" is to imply it is one of the biggest most well known fan additions to a piece of media in which it ends up having a big following all on it's own.