I'm a Serious Demon Hunter

This is a dangerous world full of monsters. However, the Holy See, which was supposed to be responsible for hunting demons, "outsourced" this job to others due to internal fighting: There are Imperial University students trying to repay their student loans... There is a half-werewolf noble lady out for revenge... There are also vampires who want to restore their family's glory and down-and-out cowboys who go around flirting with girls... A group of demon hunters appeared out of nowhere. Which one do you think is serious about hunting demons? Ron, who had traveled through time, could no longer turn a blind eye. As a judge of the Holy Inquisition, he raised his arms and shouted: "Professional matters should be left to professionals! It is our duty to restore the glory of the Holy See!" Ahem, of course the system's billion points are definitely indispensable: [The Sword of Vowed Victory: Gathers the magic power of the planet and turns it into a golden current, tearing the entire battlefield apart with one sword, causing huge damage to all enemies] [Sky Star: A huge star rock falls from the sky, causing huge rock element damage to enemies within the falling range and turning them into stone] [Gaia Energy Cannon: Condenses all the energy in the atmosphere to form high-heat energy bombs to attack the enemy, causing huge damage] [Choose and get one] (New book, new book, all readers are welcome to taste it)