Shadowguard

Shadowguard is an unlockable character within Call of Duty: WWII Nazi Zombies, he can be unlocked by completing a full challenge set in the map The Frozen Dawn, in this case being the "Shadow Hunter" challenge set.

Challenges

 * Forgotten by Death - Laughed in the face of Death (Death becomes)
 * Obtain the Thulian Scythe without taking damage.
 * Corpse Dancer - Cut them down before they rise up (Waltz of starvation)
 * Kill zombies before they are killed by the Corpse Eaters.
 * Ancient Banquet - Cannibalize the Ancient Evil (Elder Blood)
 * Obtain the Fang of An'heist.
 * King's Lament - No crown for the wicked (Crown's solace)
 * Defeat the God-King on solo.
 * Death's Sorrow - Survived when no one else could (Wreathed in death)
 * Using the "Cheat Death" ability of the Fang of An'heist, survive the Wrath of the Sun attack of the God-King.