Talk:Prime/@comment-2001:E68:543F:447:9153:D052:B70D:AE31-20180815143733/@comment-2001:E68:543F:3E5C:40AB:6EC7:236D:3BB9-20180816104229

They exist. Some examples are Lex, Paris & Orthos.

Anyway, I found a page for it:

http://warframe.wikia.com/wiki/Category:Never_Vaulted