Talk:Interception/@comment-66.108.21.51-20140612220556

Someone should add this to the page:

T4 Exterminate, Capture, and Mobile Defense keys can appear Round 3 or later on ‘Medium’ Interception missions (starting enemy level 10-20).

T4 Survival, Defense, and Interception keys can appear Round 3 or later on ‘Hard’ Interception missions (starting enemy level 20+).

Source: https://forums.warframe.com/index.php?/topic/244507-update-1370-13701-depths-of-the-void/