Um, Deanna, do you have edit access on the posts?
When your team is ready, this book of adventure will take you on a journey throughout the region to stop Mobius’ nefarious plot! Can you find a weakness to his ultimate war-machine before it's campaign of terror destroys all resistance in the region?
I'm willing to take their word that "it" is the ultimate war machine's preferred pronoun, but that is not the kind of its that should have an apostrophe. (Yes, my Pulp Power is Super Nitpicking! It's not very useful for stopping bad guys, but I can tell them everything that was wrong with their diabolical plan.)