The Red Blade of Calm

Introductory
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 Ghost Assassin with the red blade, one of the 'named mob' in Undead Ground. Supposedly, it would not be easy to find the sealed box from the monster.
 * Obtain [1] Sealed Box: Record of Wrath

Reward
You must meet with Simon in Bloody Ice for the reward:
 * Experience: 550,000 EXP
 * Amount: 350,000 Alz
 * Honor Points: 14

Completion Dialogue
Dungeon message