Explanation
This is my build for index. Nothing too crazy but you can deal a lot of damage to the Corpus. I would like to use Primed Expel Corpus but I simply don't have it yet.
Cold: Does 50% extra damage against Shielded
Magnetic: Does 75% extra damage against both Shielded and Proto Shielded
Radiation: Does 25% extra damage against Robotic and 25% less damage to Shielded
Advice
There are probably many other builds like this around, but this is the way to save my own version in case I try new stuff later on.