Bucket Of Lava
Location: Fire Storm
Price: N/A (Dropped by Sulfur Imp)
Sellback: 125 Gold
Rarity: Weird Rarity
Base Damage: 27-33
Description: Pour water on it and presto… obsidian.
Notes: Description is a direct reference to the Lava Bucket item from Minecraft.

Thanks to Tendou no Mazo.