The Calamity Mod, released in 2016, is a substantial content modification for Terraria, adding significant endgame depth for PC players. You will explore five new biomes, face dozens of new bosses, and utilize a new playable class. This mod enriches the core experience by introducing harder difficulty modes and over fifty new crafting recipes, alongside more than thirty new musical tracks to accompany the expanded adventure.

Calamity: Wrath of the Gods is an unofficial addon for the Calamity Mod that adds three interesting new bosses and a story-based character.

An extension mod for Calamity that adds an extra difficulty - Infernum This difficulty is harder than Death mode and can be activated with the difficulty selection UI in Calamity. The primary focus of the mod is expansive reworking of boss AIs. Some bosses gain extra phases for maximum "It's not over yet!" energy.