I'm working on opening Sedna. Mastery Rank 7. Really struggling against Corpus. Most of my equipped mods are maxed out with the exception of Vitality, Steel Fiber, and (the shield mod). Each of those 3 have 2-3 notches left to go (just a matter of credits and endo) I just made a similar post a couple of days ago when i was on Neptune. It wasn't that bad at the time, it was more about curiousity. Now I really need to up my defense. It's not about offensr, I'm dealing enough damage to them, but once I'm surrounded I can't kill them off or dodge them fast enough. It's specifically the Corpus I'm struggling against. Grineer and Infested don't bother me as much.

Basically I've got glass canon issues.