From publisher blurb: Fiction-first and boring-ass mechanics last, yessirebob! If you loved what I did with critical-hits in Crimson Escalation (and you should, it's awesome), then I think you'll also love Obsidian Escalation. Special thanks goes to Rob Couture for his invaluable help on the former. This is for gamers who long for combat that's short, brutal, and fun. Don't let battles drag on and on... decisive lethality shall win the day! While I intended Obsidian Escalation to go hand-in-hand with Crimson Dragon Slayer D20 and the upcoming Encounter Critical III roleplaying game, it's useable with pretty much every OSR combat system. Goes great with savage, unforgiving campaign settings like Cha'alt, as well.