(It's engraved with the tribal pattern of the Hoarfrost Mau.)

(You should take it to Tribunus Helgi.)

Player: "It's very pretty."

The Mau and the Elyos are both hot to grab this sentry post.

Player: "What do I do with these?"

I'll take them. And give you something better.

Hoarfrost Tribe's Mark shows you've worked in Asmodae's interests against the nearby Mau and Elyos combatants.