|In the Thick of It|
DisAsteroid - Destroy 8 asteroids. - 1000 Plex.
I'm a Leaf on the Wind - Take less than 150 collision damage before killing sage. - 1500 Plex.
Silent Sage - Complete mission without using a Sage Ability. - 1500 Plex.
The C5R Manta is a stealth ship. If you really hate those, consider equipping something that can reveal cloaked enemies such as Stealth Scanner.
Much like Grandalf, this enemy likes to use Sage Wave. She's also equipped with Protovolt Arcing Cannon, Plexonic Absorption Portal, Plexonic Accretion Ray, and Starseeder. The good news is that the Protovolt Cannon and Plexonic Accretion Ray will lead back to her position.
You won't be able to leave the asteroid field and go back into the clear space once the sage is uncovered. If you want I'm a Leaf on the Wind, consider destroying or pushing some of the asteroids to make a clear space.