The Dwarf Anvil of Doom is one of the most ancient heirlooms of the Dwarf race. It is on these anvils that the greatest rune weapons have been forged. Each anvil is covered in runes that modern Runesmiths cannot begin to fathom. When striking runes on the anvil, each Runelord uses techniques taught to him by his master that were in turn taught by his master and so on back to the dawn of time. Because of this, no two anvils function in exactly the same way.
This is the model from Warhammer World and GamesDay 2005.
I think it’s interesting that at one time the model was based. Looking at the images, one of them shows the Runelord with his hammer above his shoulder (at Games Day 2005) and another behind his neck (in Warhammer World).
You can now buy the Anvil of Doom from Games Workshop.