I'm completely baffled by this. How does it work, and why is it negative (or is that not why a "-" is in front of the value)? I'm changing the values and it seems to give arbitrary results. Unless if I'm mistaken, sometimes when I increase it (change the value towards zero, if it's a negative value like it seems), the damage is increased, and sometimes it's reduced.

And if it isn't a negative value, well, I've often in mods seem that people put values without the "-". I'm utterly confused.