Lux Pugio

Cannot be auctioned, traded, or bazaared, but can be delivered to a character on the same account.
Can be obtained as a random reward from the Gobbie Mystery Box Special Dial and similar sources.

"Lux" is Latin for "light", meaning luminous emittance eg. the light of the sun.

The pugio was a dagger used by Roman soldiers as a sidearm. It was a common weapon of assassination and suicide; for example, the conspirators who stabbed Julius Caesar used pugiones.