The killer mod is amazing. There are a ton of new features added and it makes the game more interesting to play. The main thing in the mod is the new boss called killer. Killer lives in his mension that is quarded by his minions. The minions are also a new mob added to the game. In the mansion there are a lot of mod spawners too, to keep the boss safe. The player need to go and deffeat the killer. The mansion spawns in a new biome called the dark. The dark is a cool looking biome but be carefull because you will find a lot of the minions here. In this mod you can craft a lot of items. You can craft end ingot and from the end ingot you can craft armor and tools that can help a lot. You can also craft a gun and bullets and a lot of other items. There is a new dimension that you will need to go to. To go there you need to craft flint and stick to be able to light the portal. In the dimension you will find new blocks and there is a new green liquid that you will have to discover. You can find the ore for the portal in caves in the overworld.