Uzil was a very rich planet, most of the time a lush forest. But when Uzraah Misary used his famous Force Move power to move the planet out of its orbit into an orbit around Graa, the planet became a moon, and the landscape became more rocky. For unknown reasons, the Quarians lived on the planet a long time, before Uzraah moved the planet. When Uzraah conquered the Graa system, they tried to leave, but Uzraah stopped them.