The Tranquility domain was created by Malbrig as a solution to the corruption of Lazarus that had been placed on the souls of some plants as a result of use of the Heart of Ueberroth. He subsequently shared with the other gods when he passed from the world (3307). Gods who entered the world since then have not been given access yet.
As the god of Tranquility, one promotes peace and happiness throughout the world and combats the taints of the darker gods. Transquility stands in opposition to the forces that seek to undermine mortals.