The Camp for the Dead

Introduction
Supposedly, there is a group of unique monsters called 'the named mob' in a hidden area of Undead Ground.

Objective
Let's go find the Death Sergeant, one of the Undead Ground named monster wandering around the camp of the dead. Supposedly it is not easy to find the sealed box from the monster.
 * Obtain [1] Sealed Box: Record about the Dead Camp.

Reward
You must return to Prewitt in Bloody Ice for the reward.
 * Experience: 940,000 Exp
 * Amount: 640,000 Alz
 * Honor Points: 17