Adds a lot of aggressive mobs, with their unique properties that can diversify and complicate your survival. Also adds new structures, equipment, blocks and achievements.
Gives you full control over spawning mobs/spawners. Add custom AI to mobs, give them better weapons, and block burning in sunlight. You decide what your mobs do and when they can spawn!
Travel around the world without barriers: RoadArchitect automatically scans your world, finds villages, and other structures, and then lays a network of roads between them.