Nak cannot be worked except with a special tool and cannot be damaged except by that tool, magic, or extremely high temperatures. It reflects lightwand beams (see Needle) and is suitable for strong enchantment.

Produced by the Chak, phase spider folk living on a moon in Arda's system.

Nak is traded with the Free Imperia, and the Superbalas is being covered in it. Personal armoring applications are being researched as well.