Description
From your description, it sounds like Stormbrood dragonians have broken apart the Monument of Enkanen and carted pieces of it into Stormbrood Lair. We need the missing Ethian Stonework to learn more about the Convocation.
Upon completion
The Stonework describes how the mage Enkanen warned of the dangers of the Convocation, since the slightest mistake could prove devastating. He spent years creating a device to shield his followers from the Convocation. Perhaps in time we will learn what became of them.