Ethoc's Grave

The Ethoc Basin is the subject of myths in many nations, but many of these stories have evolved from a central story that can be partially re-constructed from the commonalities between all the other myths. This central myth, sometimes referred to as Ethoc's Grave, is an important story for both The Everlasting Rain (who consider Ethoc a primary deity) and the Brinefaith (who consider Ethoc a lesser deity and former disciple).
The story of Ethoc's Grave intertwines with many legends about the Teyvank and the forming of Laerdt'nah (and the world as a whole), but the Ethoc Basin is the end of Ethoc's story. 
As the tale goes, Ethoc was one of the many godlings who roamed the world when it was first formed, creating and destroying land and matter at a whim and largely treating the planet like a giant playground as the godlings learned what they could and could not do with their powers. The godlings, who had been borne from the world itself, had no teachers and no guidance except that which they learned through doing. Many of the godlings found something they enjoyed doing over and over, and so they became particularly skilled in one way or another. As the godlings grew, they came to value the lands they had created, and destruction was much less common. However, they also envied or wanted lands that their siblings had created, and so they learned to control magics that gave them an advantage against one another. Ethoc, having created a land they called An-nin which was comprised of wondrous mountains and waterfalls, fell in love with water and rock. They drove great masses out of the worldscape, before flooding them or wearing them away with water. But An-nin was perfect to them, and it drew the eye of their sibling, Denwa. Denwa has grown to love the wind, and they forced Ethoc away from their land with powerful bursts of wind that wore away the peaks of An-nin. Ethoc, furious, drew up mountain ranges and walls to pin Denwa, but Denwa wore them away too. Ethoc called up the water to force Denwa under, but Denwa whipped the water into waterspouts and storms and rained terror down on Ethoc and what was left of An-nin. 
Seeing this new power, Ethoc had an idea. Ethoc enlisted the help of Tdska, the one who loved fire, and turned the rock of An-nin into glass and ore. When Ethoc fought Denwa again, they were unable to lift some of the land, and the rest became whirling and cutting storms that injured Denwa and forced them to retreat. But Denwa too enlisted the help of another sibling, Auuio, called The Preserver, who taught Denwa how to create ice over water. Denwa returned to An-nin, withholding this new power until Ethoc had surrounded themselves with mountains to create a barrier and had filled the cavity with water to protect them from the winds. Then, with a sudden burst, Denwa froze the top of the water, using unending wind to preserve the ice against Ethoc's attacks from within. Ethoc thrashed for days, but eventually they tired, and Denwa slowly went about wearing down the mountains around them and pushing the ice that surrounded Ethoc deeper into the world. Eventually, Denwa pushed Ethoc below the surface of what remained of An-nin, into a pit. Denwa filled the pit with ice, claiming An-nin as their own, breaking off pieces of An-nin to give to Auuio as payment for their help. 
But Ethoc did not die, if godlings could even be killed. Instead, Ethoc waited. In fact, Ethoc still waits at the bottom of the basin, their magic slowly melting the ice and turning the water above into a bountiful lake. Every winter, Denwa is able to prevent Ethoc from returning fully, but it is said that if you make it to the bottom of the lake, there is a surface of ice that is the top of what remains of Ethoc's prison.