Corpus use shields, so bring Magnetic (Cold + Electric) to strip shields or Toxin as it bypasses shields with a damage over time. They're resistant to Corrosive.

What is most effective against corpus?

If you're staring down Corpus enemies, you're going to want at least one of these these three damage types, if not all three: Impact, Magnetic, and Toxin. If you're facing off against the Grineer, bring Puncture, Radiation, and Toxin.

What is Corpus weak against?

The Corpus, meanwhile, heavily rely on shields and are susceptible to Magnetic, Impact, Cold, Toxin or Viral damage. Infested are weak against Slash, Heat, Gas, Corrosive or Blast attacks.