I have S&W Complete and OSRIC and don't need more rules. Got Corruption for new monsters and magic items. The rules are what you expect from S&W /Old School.
Not tried using an extra corruption score to measure alignment. The bonus XP to reward good play works very well.
The rest is what I started looking for. Monster races like Ravenswings, Chameleons, Horror Hornets, magic items ready for Old School play . . . The surprise was tons about gritty play, tricks, making play dark . . . Plus step-by-steps fro making modules and campaigns. Great value!
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