Talk:Orokin Sabotage/@comment-24575886-20141218035823

Found a good comment in the wiki forum:

[quote]Tower I Void Keys can be obtained reliably from E.Gate (Excavation) on Venus after the 3rd Excavation and every 4th one after that (Void Keys on 3,7,11,15 etc). If you're looking for something a bit more challenging when obtaining Tower I Void Keys then Orokin Derelict Survivals can give either Tower I Void Keys or Uncommon/Rare Fusion Cores at the 5 and 10 minute marks. At the 15 Minute mark both Tower I and II Void Keys can be obtained. Tower II and III Void Keys are in the same drop table but have different drop rates depending on the level of the mission. If you're looking for Tower II Void Keys then I recommend Cambria on Earth. If you're looking for Tower III Void Keys then I recommend Lilith on Europa. Keep in mind both those missions can drop both Tower II and III Void Keys.

Tower IV Void Keys are only obtained via Interception missions and Tower IV Sabotage Keys are given on the same missions that give the Tower IV Capture, Exterminate and Mobile Defense missions. Augustus on Mars is a good place to try.[/quote]

Source: http://warframe.wikia.com/wiki/Thread:573066