You can level them up using weapon toolboxes
Although I know what you mean by " power " , it is actually called damage
power ( or energy ) is a number that controls your weapon and gadget placement on bodies
for letting you know
Guys I can't believe that zeptolab took my advice at my weapon suggestion topics
but still zeptolab that programmed all these stuff ( for money )
but I think it is really good though
whst do you think ?