Destroy Verril Prime

I have been having trouble getting past these two missions: Raid Emalghion and Destroy Station Alpha. It's not that I can't beat them (I have done them many, many tiems), it's that I can't get any NEW missions. I have completed the Voinian cruiser string (I have one myself) but I want to destroy Verril Prime so I can do the Reign of the Voinians plug.

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