How do you do Horrific Levels of Damage

I'm not sure i understand what your asking for. You want to recode the damage system? If so, that would be very difficult, even for an extremely experienced coder, and also would make your mod incompatible with just about every other mod ever. If your asking how to make your weapon do a lot of damage, you can just make a procedure that runs whenever an entity is hit with your weapon (in the triggers category of your weapon) and damage the entity you hit for as much hp as it has left. That's essentially doing infinite damage.