The skill.cfg file

Heres a file that allows you to modify the health of all monsters, damage that they inflict to the player and other monsters, modify the amount of health in a healthcharger, power in a HEV charger, and a few other things. To have this file take effect on the mod that you are making these changes to, simply modify this file by changing certain values of whatever you are changing such as this
EX: sk_agrunt_health1 "60"
this is the original health from the alien grunt on the easy skill settings, by looking to the number before the quotations and the number 1 means on easy skill settings, 2=medium, and 3=hard. Now you dont want to change ANYTHING in this example exept the number in the quotations. Now the alien grunts original health on easy setting is 60, to change it's health to 30, simply modify it to look like this
sk_agrunt_health1 "30"
and for any other monster/item in this file.