Who created the Temple of Balthazar in Maguuma jungle?

[Algeron Zolo]

While ettin farming near North Kryta province, i found this rock. Its has a shiny, relfective border, and appears to be relatively flat, like a wall. What could this be, and my does it bear so much resemblance to the Temple Of Balthazar's (in Maguuma jungle) walls?

[Sereng Amaranth]

Nice find! I wonder where I left that.