The Sky Temple is Dark Aether's counterpart to the Great Temple. It houses Dark Aether's primary Energy Controller, guarded by the Emperor Ing. The Sky Temple's entrance on the Sky Temple Grounds requires ten keys to access. One key had been returned by the Luminoth champion A-Kul before her death. After returning the Light of Aether to Agon Wastes, Torvus Bog, and Sanctuary Fortress, Samus must find the nine remaining keys.
The Sky Temple is the smallest location on Dark Aether visited by Samus, consisting of only three rooms. It is nearly barren of inhabitants aside from the Emperor Ing and several Ingworm Cache.
- "The Sky temple, dark shadow of this hallowed place, holds the final Energy Controller. The greatest and most powerful beast of the Ing keeps guard over what you seek." —U-Mos (Metroid Prime 2: Echoes)
- "Soon I shall pass to the final rest. My key is in place. Through my spiritual link with to the other, I know where their bodies lie. I shall leave this knowledge, that their last location in the dark world can be known. May this knowledge lead our warriors to the Sky Temple Keys. The time draws near, Hear the words of A-Kul, she they call Champion of Aether, Know that my warriors fought and died with uncommon valor. Do not look unkindly upon their failure, for they died to save us all." —Luminoth Lore (Metroid Prime 2: Echoes)
- "We learned that the ruler of the Ing dwelled in a place dubbed the "Sky Temple" by our forces. This place held the planetary energy of Dark Aether as well. It was heavily guarded, and entry was barred by a great gate requiring ten keys to unlock. These keys were hidden throughout Dark Aether by the Ing. A mission was planned, one that would find the hidden keys and recover our missing energy from the Sky Temple." —Luminoth Lore - The Sky Temple (Metroid Prime 2: Echoes)