Imbuements: (Empty Slot).
The Great Shield has existed since nearly the beginning of Tibia when the only server was called Tibia, which is now present day Antica. It's known that the first Great Shield was owned by Cressir on Antica. Dragon Lords for a short time dropped Great Shields. Looting this was harder than looting a Dragon Scale Mail. Back in that times there was only three Dragon Lord spawns, the one in the Plains of Havoc, the one in Thais, and the one in Deeper Fibula. Also Dragon Lords were the hardest monster back then, and the highest levels were around 50. The value and high defense of the shield was deemed too much, even as a rare loot, so it was soon removed from Dragon Lords.
There are still many rumours concerning the origin of the Great Shield. The fact is that many are on Antica and a few others are scattered about other servers.
Now it can be found in more worlds, since it is dropped by some bosses around Tibia.
The sprite of this shield was changed during Christmas Update 2004. Before that, it used to look like this: