Skull cup

Skull cups are cups that are either made from the Skulls of vanquished enemies, or cups designed to look as it that origin.

While fairly rare (less than 25 of the Union Members that at one time held that practice of making skull cups still did at the time they joined, with only the Neo Vikings of Nilfeheim and two of the tribes on Guayas continuing to do so after their society joined the Union.)

On Nilfehein, the skull cups are called blótbolli and used in some ceremonial traditions.

Several pirate captains including Black Velvet, are also known to use skull cups to casually intimidate those they come across.