After Three Years of Sign-In Border Duty, I Summon a Million Snow Dragon Riders

[Mindless power fantasy] Three years guarding the frontier, three years of sign-ins, three years enduring humiliation. I transmigrated into the body of an abandoned royal son and was exiled to the borderlands. The entire court laughed, saying I was just a stepping stone to clear the way for the crown prince. They had no idea that every day I survived on the frontier, I could sign in once. [Ding! Sign-in at Beiliang Pass successful. Received “Ten Thousand Great Snow Dragon Riders”!] [Ding! Sign-in at the God-Burying Plains successful. Received the loyalty of “Bai Qi, the God of Killing”!] [Ding! Sign-in at the enemy capital successful. Received “a million dan of provisions”!] Now the three-year term is over. As I lead a million iron cavalry to the gates of the capital, those who once bullied and humiliated me tremble beneath their hooves. My father, the emperor, turns deathly pale on the dragon throne. “My son... when did you raise a million soldiers?” I point my sword at the capital, my voice icy. “These past three years, Father, your son has spent every day on the frontier thinking of how to give you a... surprise.”