[quote=@Vlad Tepes]It's just that in the past I have used the original honor system but someone always ended up godmodding and ruining the RP for everyone else.[/quote]

I used to have the same experiences, but don't much anymore. What I ended up learning was basically that communication is king; that most people typically respect a GM's decision, so don't be afraid to come down "hard" as long as you remember to communicate; and that sometimes if you just roll with what players are doing and do what makes a better story, people will have more fun with that than with a "perfectly balanced and fair tabletop-lite."

If they want to write up a bunch of fluff detailing how their magical sword strike was [i]SO[/i] powerful, it left a huge rift in the ground, maybe you can let them have that but then say, "Yet, as the dust cleared from such a superhuman impact...the villain stood tall. As they watched, his body--rent from collarbone to hip, hanging on only by threads of flesh and viscera--began to knit itself back together. Flesh writhed, wormlike, devouring itself like Ouroborous until a severed arm once more clenched its clawed fist..." so it's like "yeah, it worked, but can you pull it off twice in a row?" Maybe the villain has a big scar or something now that can be exploited by another player, and so forth.