Talk:Ember/Prime/@comment-75.82.140.73-20140422024128/@comment-24067351-20140517004537

either from t3 endless defence (non-void missions), http://warframe.wikia.com/wiki/Defense

or from t1 void missions

or from t2/t3 (non-void) survival missions http://warframe.wikia.com/wiki/Survival