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The content was relevant to an obsolete version of Warframe, and has since been removed, retrieved and or revamped.
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|Tower I||Tower II||Tower III||Tower IV|
|TII Mob. Defense||Ø||Ø||Ø||Ø||Ø||Ø||Ø|
(Edit Tower II Drops)
Cells marked with a "✔" can drop the key listed at the top of the column.
Cells marked with a "Ø" can not drop the key according to rules set forth by DE.
Cells left empty mean that the corresponding key has not yet been found in that mission.