Expensive endgame toys would be useful. Like energy weapons, which shoot positive or neutral mass (somewhat similar to Stelaris’ proton launcher and neutron launcher). As I imagine, protons would be more damaging, neutrons - more radioactive (~15 minutes half life).
GT6 already has “clothes”, so expensive-to-use endagame armor would be useful. I have no good ideas what it should be. I just have a “tiny” problem, which started when I drilled through a pigman. One mistake, and nether is much more dangerous to me 