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Hellfire Greataxe
Hellfire Greataxe
Very Rare
1d12+2 Slashing
Thermodynamo: Whenever you deal damage with this weapon, you gain 2 turns of Heat.
Weapon Enchantment +2
Proficiency with this weapon type unlocks:
Anything hit by this has the life expectancy of a glass hammer.Greataxes Two-Handed
Location - Hellfire Greataxe
Located at the 
Sorcerous Vault. To gain access to it, you will need to go through the Portal to Sorcerous Vault. It will only appear after you interact with the Collapsed Book.
After you gain access to the vault, you will reach three doors, two of them will be locked, and the last one is called Silverhand. You need to access a hidden room
- Go through Silverhand door and destroy the Illusion door.
The 
Hellfire Greataxe will be inside a Gilded Chest.
Discussion
Sorcerous Vault X: 366 Y: 941: In a gilded chest in the "Illusion" section