A focus on Abyssalcraft, a major exploration-based mod that adds several new dimensions and a ritual system.
To aid with the exploration, several content-packed mods:
1. Tinker's Construct, for a complete overhaul on weapons and tools, along with various tweaks to it.
2. iChun's Portal Gun Mod.
3. Thermal Foundation and Expansion for about a billion new metals, materials, machines, etc.
Along with several quality-of-life mods for improved D O G experience, transportation, etc. Have fun.