For those who have not completed games in the Xenoblade Chronicles series, this page contains spoilers regarding the plot. Discretion is advised.
The Ether Furnace Controls are a switch in Xenoblade Chronicles. They are located in a small room southeast of the Great Hall in Alcamoth and are accessible after the events at Mechonis Core. They reactivate the transporters of Alcamoth. They must be repaired then activated during Broken Ether Furnace 2. After fixing them, the Primordial Telethia appears in front of the room and must be defeated. Restoring power to Alcamoth's transporters makes possible to reach Whitewing Palace and Revelation Hall to complete Vidian Rescue Mission and A Merciful End respectively.