Fight Dungeons and bosses. Make your way through the evolution of draconium, flux, tinkers construct and industrialcrafts technologies. If you need more chests all the time, make the ME storage system and you only have to make drives to get more space! Make Extreme reactors and store TONS of energy!
When you are ready to fight anything, go ahead for the Ultimate Dragon, Impossible to cheat, because you will die in creative too.

Draconic Evolution: Draconium and Draconic Armor and tools. There's even a massive and complicated reactor
Tinkers Construct: Make a tinker smeltery and mix ores to get new ones or melt ores to 2x ingots. Many useful tools can be created. Even armor
Industrialcraft 2: Power, Machines, and tools+armor. this is a mod that will not combine to others so be aware that this mod won't work with fx thermal expansion.
Thermal Expansion/Foundation: Also Power lots of Machines and more
Extreme Reactors: A reactor which will generate power with Yellorite it isn't too complicated and fits with Thermal Expansion
Applied Energistics: This is the mod with ME Storage system. With energy acceptors, it can use power from Extreme Reactors And Thermal Expansion
Redstone Flux: A mod with Armor and tools
Journey Map: A map of the world you are playing on (J)
Ender IO: Machines that also supports Thermal Expansion
Nether Ores: Ores that spawn in the overworld will also spawn in the nether as nether ores, and will give double.
Gravestone: When you die your loot will be in a gravestone spawned on death
Chisel-MC: Change blocks look
Elevator Mod: An elevator block (shift or space)
Blood Magic: Make powerful items like armor out of complicated recipes and an alter or maybe your blood.
Doomlike Dungeons: Spawns dungeons around the world with hard mobs.
Advanced Rocketry: Make a rocket go to other planets. Have Fun
CarryOn: Carry blocks or mobs. you can carry a chest full of loot or a cow. You can even put to animals on top of each other.
Wolfarmor: You can now make armor for your wolf/dog.
The Twilight Forest: A place where you can kill one boss after another. The bosses get harder and harder. start killing Naga, and unlock a new area and so on.
Travellersbackpack: Make a backpack with inbuilt sleeping back, 2 Water/Lava Tanks, Craftingtable and of current inventory space.

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