The mod's for a game called Terraria, and runs on a special modding platform called TModLoader. It's called the Calamity Mod, which is still a WIP. Thanks for the neat game!
EDIT: Made it to 4th phase of Hard Mode through sheer error and luck! Yay, a new phase to fail on!
Ahhh look at all those bosses! I like Bumblebirb especially.. I loved the time I spent with Terraria so it's really cool to see that folx are still modding, improving, and adding to the game!
