Essentially, it’s a system-neutral, wizard-based class that focuses on one thing. Can you guess what that one thing is?
That’s right. It’s punching.
I encourage you to read the flavor text of the muscular puncher, because it would be wrong of me to re-print it here. Suffice it to say that the muscular puncher presented here has been translated, mechanically, into 5th edition D&D, and turned into a CR 3 NPC. It’s got a lot of hit points, and deals a lot of damage. And if you encountered more than one of these guys, I can see things getting a little bit nuts VERY quickly.
As always, here’s a link to the PDF: LINK.