Despite ive found many uses for most books, I haven't found any insightful and cost effective strategic uses for "The End is Nigh!" other than overcharging a fellow WX (not that its a bad use, of course).
Is it good as a straightforward lightning damage weapon? My experiences with it as a weapon were not exactly worth it, the damage didn't seem like much and although affected mobs bursted into flames, the overall damage was mostly "meh" and I felt I would have made more damage by putting them all to sleep with STS and start hitting them one by one with a dark sword. In any case its quite possible I'm not using it at the right time or with the right mobs.
I don't usually try to get milk out of the volt goats either, so thats probably the second good use I'm missing out. I did use it to power up a few lightning rods, making them glow for a few nights, but it still seemed a bit of a waste, as I always feel I could have made a life giving amulet with that red gem, and more STS or "on tentacles" with the papyrus, instead.
Anyway I'm curious, do you have some special strategy with this specific book, beyond boosting the robot friend, that can be shared? Weaponized book tips, gets bonus potato cups.