A gigantic frog made of living crystal. Clearly from another plane, it currently lives in a subterranean lake in the Saurian Wasteland.

In order to appease the creature, Saurian priests offer sacrifices of dead citizens. They are dropped from Dunshab Lakebed above into the lake below. Assuming incorrectly, the frog is not interested in devouring the bodies it is fed. Instead, it is drawn to the treasures that arrive with the bodies.

Inside the beast’s mouth is like the center of a geode: crystal structures grow all around, slowly enveloping and dissolving the treasures this beast has consumed.

It closes its mouth, crushing you against the rough walls of its throat, then spits you back to shore. - Saurian Wasteland (GS-ADV5)

Decades ago, Khalo Zat was successful in opening a portal into Kleetoth, Plane of Crystals, allowing crystalline beings to enter the Wasteland.