The most inhabitable of the tiers. Ketrill has been a centralized tier for the civilizations to mingle and socialize with each other. Billowing machines and gears spread throughout the surface and deeper into the tiers crust extending all the way out to the bottom. Settlements here receive a diverse type of weather as the machinery within the crust creates environmental effects. Steam fogs will plume from the ground and engulf a settlement for hours at a time. Spire casts shadows upon the Ketril that will last months as the settlement is eclipsed by spire; Substantially dropping the temperature but still liveable.