Shiny Golden Chest of Awesomeness

After killing the Boss on the second map (boss room) three chests will appear at the start of the map, near the entrance (Yolotl is exception, you can find the chests on the left side of the map). You can open the chests by using the Key of Defeat.
There are two types of chests:
The Undefeatable Chest and Shiny Golden Chest of Awesomeness

This Golden Chest will not always spawn. The higher the difficulty, the higher the chance for spawning is. You will need x10 Key of Defeat to open one Golden Chest.
If you are lucky you can get up to 3 Golden Chests at same time. (luck is a relative term considering the chest's drop)
Possible Rewards:

• Gold
• x50 Draken
• Andermant
• Gems
• Dyes
• Essences
• Newborn Heart (pet part)
• Doll Body Chest
• Draken Core (random - scaling with difficulty)
• Lesser Rune of Relentlessness
• Rune of Relentlessness
• Lesser Rune of the Vanquisher
• Adornment of the Vanquisher
• One of the Executor of the Great Plagues set pieces
• Gold-embroidered Silk Fabric (craft Cloak of the Undefeatables at the workbench)
• Worldly Unique Items
• equipment of different rarity and tier

Old

Possible Rewards:

• one of the pet parts :
  • 
  • 
  • 
  • 
  • 
• Lesser Rune of Relentlessness
• Rune of Relentlessness
• Lesser Rune of the Vanquisher
• Gold
• Draken
• Insignia of Honor
• gems
• Cloak of the Undefeatables (comes in tiers)
• Adornment of the Vanquisher (comes in tiers)
• Worldly Unique Items
• equipment