Warframe

[clonezero]

You can get some cells from Sargas Ruk (Saturn > Tethys) or Kril (Ceres > Exta). Then you can just farm credits from Tower I-III capture keys or alert mission if you're out of keys.

where do i find the tower capture stuff? are those the things on the left side o.O?

remember those keys you sometimes get in missions? Using them would let you start a mission onto the Orokin Void and in particular you should be looking for Orokin Void Capture Mission Keys.