The Key of J-Stl (also known as Sky Temple Key 1) is the first Sky Temple Key required for access to the Sky Temple in Metroid Prime 2: Echoes. Returning to the Battleground in Dark Agon Wastes, Samus must climb the ledges on the left and locate four floating platforms with the Dark Visor. Ascending them, Samus must locate a ledge with a Flying Ing Cache using the Dark Visor and Screw Attack to it, then destroy it to get the Key. The Key can be collected before obtaining the Light Suit to shorten the quest afterwards. Dark Agon Temple Key 3 is also located in the Battleground.