This is the command :
PedSetDamageGivenMultiplier(ID, 2, 2.00)
The command will double the damage the Ped is doing.
Meaning if I have : local Russell = nil
and I set the command to be like this : PedSetDamageGivenMultiplier(Russell, 2, 2.00)
Russell will do 2 times more damage.
Now ignore the 2.
Change only the 2.00 to make the damage higher or lower.