For Every Rose, A Thorn

For Every Rose, A Thorn is a minor Easter Egg that is present on Zorn der Toten, the first map of the "Blizzard of Glatteis" story arc of the Black Ice Zombies storyline. The easter egg involves the Hand Cannon Rose, which is present all Black Ice Zombies maps.

Once completing this minor easter egg, Rose will become Thorn, having three unique Weapon Perks called "Mark of the Devourer", "Soul Devourer", "Crown of Thorns". Just like Lumina, Thorn can only be Pack-A-Punched through an additional step, should the player wish to do so.

Trivia

 * This easter egg is not present on Survival of Last Stand maps.