I’m running Mentat through a world that has Mental Powers, Mecha, Lovecraftian Mythos, and a fight against evil aliens.

Here’s some high points in the construction of a world…

1. Post-apoc brought about by alien KE bombing.
2. Previous society was hi-tech late 21st century with a Moon Base and robots
3. Current society is a warped post-apoc where some tribes name themselves after football teams. Some tribes believe in cargo cult aka ‘if we keep the airport grass short, then one day, the 747 angels named Fedex and DHL will land and give us all the great things we heard our ancestors talk about–Teevee, and Re-Mote Con-Troll. (sounds like a great opportunity for puns and jokes–like renegade robots are name Re-Mote Con-Troll–like trolls…). Other tribes, more successful, survive on trade and salvage. These are more mobile tribes, and have less durable dwellings. Primary form of entertainment for the mobile tribes is haggling, talking, and storytelling–in other words they are great liars.
4. The great cities are still heavy with loot, although the most obvious stuff has still been taken. But there are buildings with bricks and I-beams and copper wiring….
5. Battle bots on the moon defending the Earth, somewhat. Still raids to suppress new tech get through.
6. Current time is 2315 so this war has been going on for a while.
7. An adviser wise man character who’s old enough not to be totally trustworthy.
8. As its anime, psi powers exist to a degree.
9. Say we have tech aliens who worship the Mythos…and they summon the Mythos when they are having real problems. This gives us Gundam vs. Lovecraft….