Let me start this by saying I own ALL of Sine Nomine's core rulebooks in Print and PDF. They literally are that good. If you are an improv-style GM, Kevin's rulebooks are the ones you want. Tools for a long and strong campaign? These right here, there are no better. Fantasy, sci-fi, cyberpunk, post-apoc, Lovecraftian horror, quasi-historical - Kevin has them all.
Stars Without Number Revised Deluxe, Other Dust, Spears of the Dawn, and Cities Without Number: Free Edition are all in the Starter package for 12.95. The Bonus Collection adds Worlds Without Number Deluxe, Wolves of God, Scarlet Heroes, and Silent Legions and comes to about $26 as I type this.
Seriously, you can't go wrong with Sine Nomine's rulesets.
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