Warp to Moscovia (@go 25).

Walk to the Western side of the island and talk to Thanos (Located at 151 170). You need to have a Lord of Death Card in your inventory for Thanos to speak to you about the quest.

Thanos will give you a list of items. Return with the required items to make Black Death Aura

1 Lord of Death Card

3 Hypatia's Astrolabe

2 Fable Thread

2 Jessica's Bell (Item)

1 Amistr's Eye

Complete this quest and you will receive a Black Death Aura.

All of the miscellaneous items for this quest are boss drops from Catacombs level 2 (with the exception of Lord of Death Card), which isn't open often, it would be wiser to farm zeny and buy these items from other players.

Lord of Death Card will be taken from you at the end of the quest.

To do the White Death Aura Quest instead, talk to Roho.