Kyle's sister Lena suffered from fatal "dust exhaustion syndrome" due to long-term exposure to dust and fog, and her life was passing quickly. The only hope is the legendary sacred object left by the first generation of engineers - "**The Primal Core**", which is said to be able to purify all ether pollution. In order to save his sister, Kyle must break into the heavily guarded Skydome and steal the Origin Core from Chancellor Silas's private vault.
