A build from around 4 years ago, back in 0.A (The current stable build is 0.C), the way how I did it is that I made a martial arts master and basically made it end game (Good skills, mutations, bionics, etc.) Then I raided every military bunker, base, or outpost I could find for granades (No, this isn’t a spelling error).
Granades are pretty much a joke item, you pull the pin and hope you get a buff, which boosts your stats permanently. You can get nerfs, bees, bugfixes, or reverts which decrease your stats, spawn a cloud of ‘bees’ that blast your pain up and can’t be killed or escaped from, kills insects and lastly cures ailments or damage respectively.
I amassed around 15-20 granades and didn’t stop until I ran out of granades. Then I ported over my save and edited the name, gave it a threshold (Chimera), and stripped down to nothing and reverted all my skills to 0, and spawned myself in the middle of a city as a challenge.
So far I got rivtech armor, a armored and souped up humvee, and a massive amount of items stored in the car.
Basically all i’m doing is wandering around and trying to find a strong challenge to my character. But to be honest, it’s difficult. NPC’s that are wander spawned are instantly hostile, I instantly kill pretty much anything at close range, My health is sky-high due to my mutations and strength stat, and I can pretty much instantly regenerate my health by feeding on corpses or meat in general (Yes, sometimes I butcher zombies for meat, since I can eat it).
But honestly, I can’t bring myself to give myself a nerf or something, i’m not a big fan of artificial difficulty.
Right now i’m clearing out a mall while taking quests from a refugee center.