Squiggles's Agartha Mod

The mod draws on the Agartha belief, an underground world said to lie beneath and parallel to the surface world, and gives that name to a set of dimensions. Several of them are added. The first, Lithosis, is a land of stone and darkness that is reached by digging underground to a temple made of bedrock, with a portal at its center. Light is scarce there, and nearly everything is made of stone, but the ores are plentiful.

Further dimensions are Catharsis, a realm built around a dichotomy, and Praeceps, a place of jagged cliffs and danger. Each is entered through a standard portal frame built from a specific block, activated with an Agarthian Power Crystal. Monsters drop a little more experience and item drops, along with money, mana and health orbs, and rarely an Agarthian Power Crystal. Servers that run it need every player to install it too. Files are published for Forge only, for 1.7.10.