Twilight Encounters is a supplement which includes a revised system for combat.
[2] Twilight Encounters was published by Game Designers' Workshop in 1990 as a boxed set.
[1] Allen Mixson reviewed Twilight Encounters in White Wolf #24 (Dec./Jan., 1990), rating it a 3 out of 5 and stated that "In summary, Twilight Encounters is worth it just for the scenarios.
The fact that a rulebook with better rules comes with the set is pure gravy.
They are full of much needed innovations and they speed up the play rather than detract from it.