Ok... but if they are at the point where they can basically tolerate eachother's presence, why is the war so close to breaking out again? Is there something specific that had happened/ is about to happen? 

Did you mention something at some point about making up species? Or was it simply picking some of the more eccentric ones to add in? If we are going to make some up are we going to want to use some that have already been created as well?

Did we ever begin to touch on how they could conceal themselves from the humans?

I tend to plan by asking questions of my partner, and then just continuing to ask questions until I reach some sort of satisfactory explanation. If you ever want me to contribute a bit more, especially if it gets to the point where it seems like I'm just asking questions to be annoying, feel free to ask some of your own. :)