Editing DS Manual (section)

=== A note on zero-stat reductions ===
If any of your stats go below zero you are probably dead or otherwise unable to do anything you are normally useful. At exactly zero, each stat has a special effect on you.

* ''SPD=0: you are unable to do anything but a slow weak stride, though still conscious. ''
* ''STR=0, you are incapacitated and conditions may render you unconscious, or even dead. ''
* ''END=0 you are unconscious, and maybe even dead depending on the scenario and DM’s kindness.''
* ''PWR=0 you are physically and mentally drained, you are able to only walk (and not run or flee). You may continue to “cast” using END, and if you choose to cast Magic Spells or perform Wondrous Feats using your END instead you may only expend 1 point at a time and each attempt may render you unconscious due to strain, a roll that will depend on circumstance, but by default is a 1d10, in which your roll should be lower than double of your remaining END.''

Other stats include Hit Points (HP) which is your health, Rapid Regen (RR) which is how much HP you regenerate every turn, Gold Pieces (GP), which is how often you get laid. Here’s a quick cheat sheet starting and advancement pretty bullet list for reference usage

''Strength ('''STR'''): How much damage you can do.''

''Speed ('''SPD'''): Speed of movement/attack/reflex, also initiative.''

''Endurance ('''END'''): Hit Points and Rapid Regen come from Endurance.''

''Power ('''PWR'''): Ability Power, the well you draw upon to cast spells or perform wondrous feats. ''

''Other stats include:''

''Hit Points ('''HP'''): Health status''

''Rapid Regen ('''RR'''): How much HP you regenerate per turn.''