EvilCraft

Progress starts with mining Dark Ore with an iron pickaxe or better to obtain Dark Gems, and the mod's guide book explains its systems in game. Blood is gathered by slaying mobs by hand or through more advanced machinery, and a Blood Infuser imbues items with it. Blood also feeds other machines, including the Purifier, which strips enchantments from items and gathers potion effects. Dark Gems can be crushed and used in several crafting recipes, and Dark Temples hold Environmental Accumulators for controlling weather.

Mobs leave behind Vengeance Spirits when they die, and these can be collected in boxes, placed in a Spirit Furnace or used for automatic drop harvesting. Customizable, upgradable brooms let players fly, Dark Tanks store liquids in higher capacities and can export them automatically, and Biome Extracts transform biomes. Installation needs Cyclops Core, which the mod requires to run. A server running it needs every connecting player to have it too. The code is MIT licensed and open source, with public links to the source, issue tracker and wiki.