I have enough Mutagen Masses and Detonite Injectors from running Invasions, Drake. That's how you make them, lol.
Also I farmed Zephyr and have her building. I find that generally, safest is to use Frost - when an Oxium Osprey charges Snow Globe, it dies, but the game considers that to be a power kill, so it drops Oxium.
Sadly I sold my Frost due to derp and unhappiness, so instead I used Nova. Kappa, Sedna was a great place to farm. My Zephyr should now be ready in another 63 hours, or Monday, 1 am. I'll probably wake up early to play her.
...Also I can forsee Zephyr + Penta as being ridiculously cheap. Fly high, Penta safely.