To begin, go to this folder:
\Steam\steamapps\common\Planet Centauri\assets\moddable\Weapons\Standard

Next, open "swords" through Notepad (right click > open with > notepad)

Change these parameters:

// Physical Damages (pierce, blunt, cut, expode)
0 0 9999 0
// Elemental Damages (fire, ice, rock, thuder, light, shadow)
1 1 1 1 1 1

Save.Done!

// Physical Damages (pierce, blunt, cut, expode)
0 0 3 0
// Elemental Damages (fire, ice, rock, thuder, light, shadow)
0 0 0 0 0 0

Similarly, you can add damage to any weapon.You can also add points of stamina and life, let me know and I'll show you how