Mhm, unfortunately I could guess you might get rude responses asking it directly... well, it's their loss! ^^;
Seems really vague at least to someone not doing it much, so I can only guess, and only thing by looking into it I can think of, is that they refer to the Periapts of Readiness, Periapts of Vigilance, and Periapts of Adaptability.
As for how you are supposed to know which one they mean, if it even is this, I don't know. To progress to a certain NM would require you to defeat others so there is that...
What do you think?