Frost-Tipped Eggshell (quest)

Objectives
Return the Frost-Tipped Eggshell to someone within your faction's Brawler's Guild.
 * Frost-Tipped Eggshell (provided)

Description
A piece of an eggshell, presumably penguin. Its edges are covered with rime, and based on its curvature, this egg was quite large when it was intact.

Strangely, the inside of the eggshell has a message written on it, in jade-green ink:

RETURN TO BRAWLER'S GUILD

Rewards
You will receive:

Progress
You have the look of a messenger about you. What do you have for me, ?

Completion
Ah, you've found one of my treasures. Well done, adventurer.

In return, I will allow you to purchase one of my rare challenge cards.