Variant is my GLOG hack. I figured I'd start with ability scores.
Arnold started the tradition of generating ability scores using d4s instead of d6s and I'd like to preserve that tradition in Variant. Instead of using GLOG's roll under system, however, I've opted for Knave's roll over system.
Each character rolls 3d4. The lowest result is their modifier and they add 10 to that to get their score .
The math works out to PCs having a +1 or +2 most of the time with a +3 or +4 being rare. Compared to modern 4d6k3, a bonus of +1 is twice as common, a bonus of +2 is 30% more common, and a bonus of +3 and +4 is as common.
The main kind of roll related to abilities is the check. PCs make checks by rolling a d20 and adding their modifier to the roll. If they meet or beat 15, they succeed. If not, they fail. This number changes depending on what the PC is rolling. For example Attacks.
If you're not sure what that number should be, if the PC isn't opposing someone, go with 15. If it's easy, it's a 10. If it's hard, it's a 20. If the PC is opposing someone, go with their number of HD + 10. If that someone is particularly good at whatever the PC is opposed against, add 5 to that number. If they're bad at it, subtract 5.
Negative modifiers will be a thing. Just subtract 10 from the PC's score: an 8 is a -2, for example. A -10 modifier equals death.