Recurrent Complex adds the extra village buildings and RTG changes extreme hills to full-fledged mountains.
Blocks (from left to right) are from Blood Magic, EnderIO, and Immersive Engineering. Armor and weapons from EnderIO, Roots, Botania, and modified with Quark.
Roguelike Dungeons adds challenging randomly generating maze like structures, filled with monsters and treasure.
This shows several features of this pack; notice the larger mountains in the distance from RTG, the "fuzzy" leaves of Better Foliage, the larger and more ornate village structures from Recurrent Complex, and the entrance to a Roguelike Dungeon.