In Star Wars, the Death Star superlaser based on weaponizing kyber crystals was the big project the type III civilization of the Star Wars galaxy was working on. What other big project could a Type III civilization (one that has already achieved Faster than light travel) could be working on developing? Forget teleportation, time travel and the containment of a singularity. I have deemed all 3 of those to be impossible in my Type III civilization. What else could be the big project?