The letter was in my handwriting. I could tell that much. The return address was a strange string of seemingly random numbers and letters. As I read, I quickly became skeptical.

Dear Jacob, if you’re reading this it means something terrible has happened to my world. You are one of many receiving this letter but I cannot overstate the importance of secrecy. Do not share this information with anyone. There’s no telling who we can trust. First, I want to get the important bits out of the way. I am you. Well, a version of you at least. I’m from a parallel dimension that is like yours in many ways but different in so many more. My world experienced a traumatic event 15 years ago when the ravages came. They are interdimensional space raiders that plunder realities wholesale. We had little hope of defending ourselves against such an overwhelming force until we found our EFS. The Eternal Flow Source. Every reality is linked by a mysterious energy. If you can learn to tap into it, the possibilities are endless. It gave us the power we needed to fight back. We might’ve won too if we hadn’t been sold out by one of our own. I am telling you all of this because the ravagers are coming. They may already be in your world, hiding, waiting to strike. Luckily, I’ve managed to locate your EFS nexus at these coordinates: 36.2679 N 112.3535 W

Go there as soon as you receive this. You’ll have to get past the-

The letter cut off there. I would have chalked it up to some very elaborate prank had I not seen the news. Our living room tv was turned to CNN. The news chopper circled what looked like a hole in the sky.