Necromancers – “Assault” [Campaign 3, Mission 2]

Hey, the number of Titans is increasing. I'm talking about the ones standing near Mythic City.

Is this a question? In any case, does it matter if the number increases or not? They'll leave anyway once you build Mythic City.

Added 2 minutes later
By the way, once an orange one arrived on the third day. I replayed, and it arrived later, when I was able to defend myself.