CONQUEST BOSS HELP.

You have to perform the feats associated with that boss. 

If you go to the pre-battle screen where it tells you what enemies are present, you can also see arrow toggles that take you to another info screen. 

Here's that default screen with info toggle circled: 

If you press it exactly once, you get info on the feats, like so: 

Here you can see a faded-out feat that I have put in a red box. It's faded out bc I have completed that feat. 

You can also see a bright-text feat. it's still bright because I did not complete that feat. In the bottom corner of each feat description, you also see how much that feat is worth. I received 7/11 keycards on this boss battle because I completed the node at 3* (first 3 keycards) and I completed one feat (AV(DD) surviving) that was worth 4 keycards, but I did not complete the last feat (win will a full squad of Geos). 

If you hit the info toggle again, you reach the screen that gives you the name of the Enemy Modifiers: 

But to get the full text of those modifiers, you have to tap them. 

If you do, you get a text box like this one: 

Of course there are 2 info toggles: forward and back. You can scroll through the full slate of info screens and loop back around to the beginning if you just keep pressing the info toggle moving in the same direction. 

Hope that helps.