There are a total of 9 keys, 3 in each area, all are located in Dark Aether. They resemble floating gyroscopes with crimson jewels at their centers.
Dark Temple Keys do not count toward the game's item percentage. When obtained, the Key Attainment Jingle is heard.
|Dark Agon Temple 1 2 3 | Dark Torvus Temple 1 2 3 | Ing Hive Temple 1 2 3|
Metroid Prime 2: Echoes hint system
"Dark temple door is locked.
Three keys are required to enter.
Recover temple key."
Dark Temple Key
Metroid Prime 2: Echoes
This Dark Temple Key is one of three needed to open the Dark Temple of Agon / Torvus / the Ing Hive.
You must collect all three keys to gain access to Agon's / Torvus' / the Ing Hive's Dark Temple.