Located deep underwater east of Shastaan, the city of Kelsys had been hidden from the outside world since the Great Artifice. It was only after the city's elemental guardian Rashida disabled the Lutha Kelma enchantment that the city was revealed to the realms. Once home to the fish-like Kelki and various species of underwater creatures, Kelsys had been built using expert knowledge of machinery and craft, allowing one to travel in airlocks from dome to dome.

After the planned deception of the Spellshapers of the North, they turned their focus on trying to open a portal to flood Spinesreach. However, their ritual went wrong, turning Kelsys into a destructive whirlpool and calling forth the Great Kerrithrim from the depths of the unknown. Thus ended the Underwater City of Kelsys.