This pen is indeed mighter than the sword

The Inka Pen is made with high-strength aerospace-grade stainless steel which is hardened then CNC machined and then laser engraved. Its lightweight and watertight. "The pressurized ink cartridge ensures the pen will write wet or dry at any angle, any temperature, and any altitude". Can be used in short length or full-length and even has a PDA stylus. US$20 for stainless steel or US$50 for Titanium version.

[Inka Pen]