Reference!
Treasure Chest 57 lvl (ID 21813) is a chest that has a drop and spoil, but if you kill it, there is a chance that a Treasure Box will appear instead. You can get armor and weapon sharpenings from it with some success, use 
Deluxe Chest Key. This chest can be found in locations Field of Massacre, Dragon valley, The Giant's Cave, Forsaken Plains, Frozen Labyrinth.
Treasure Chest 57 lvl: description
To find it you need to teleport from Town of Aden to Field of Massacre.
Treasure Chest 57 lvl: characteristics
HP (x1).
Increased defense against all types of magical attacks.
HP 2806
P. Atk 742
M. Atk 404
P.Def 340
M.Def 276
Basic parameters:
Basic
STR 40
DEX 30
CON 43
INT 21
WIT 20
MEN 20
Drop and spoil (x1 rates)
| Drop | Chance | Qty | Spoil | Chance | Qty |
|---|---|---|---|---|---|
 Adena | 70% | 533-1088 |  Recipe: Earrings of Black Ore | 1.424% | 1 |
 Charcoal | 3.887% | 1 |  Adamantite Earring Gemstone | 6.903% | 1 |
 Suede | 2.592% | 1 |  Scroll: Enchant Weapon (Grade B) | 0.0526% | 1 |
 High Grade Suede | 0.3239% | 1 | |||
 Zubei's Boots Design | 0.2479% | 1 | |||
 Avadon Boots Design | 0.2479% | 1 | |||
 Zubei's Gauntlets Part | 0.2479% | 1 | |||
 Avadon Gloves Part | 0.2479% | 1 | |||
 Metal Hardener | 0.1555% | 1 | |||
 Life Stone: level 58 | 0.07774% | 1 | |||
| Recipe: Earrings of Black Ore | 0.04207% | 1 | |||
 Mold Hardener | 0.0338% | 1 | |||
 Mid-Grade Life Stone: level 58 | 0.01944% | 1 | |||
 High-Grade Life Stone: level 58 | 0.00194% | 1 | |||
 Zubei's Boots | 0.001836% | 1 | |||
 Avadon Boots | 0.001836% | 1 | |||
 Zubei's Gauntlets | 0.001836% | 1 | |||
 Avadon Gloves | 0.001836% | 1 | |||
 Top-Grade Life Stone: level 58 | 0.0003995% | 1 |
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