Homebrew rule: damage threshold mechanic

[knightofrubus]

For posterity as this was already up in the FB group. This is a tweak to the game to use a Threshold mechanic for damage. It still uses most the combat rules as is but might need some minor tweaks to make it work 'right'.

Comment and critique are welcomed!

https://docs.google.com/document/d/1...t?usp=drivesdk