Strike Terror Into Their Hearts (DoS2)
"It seems to be a soldier's journal of successful tours, where the author focuses on scaring the enemy into surrendering. You assume it is a peaceful treatise on war psychology until you find a small sheet of paper hidden within, which details how to make a grenade that can strike terror into the hearts of your adversaries. Unfortunately, it seems to require "one tormented soul"..."
This book teaches the player how to make a Terror Grenade.