A guy invades hell, to murder all demons,whether they oppose him or not, using high caliber rifles,12 gauge shotguns,a minigun,a rocket launcher, a lightsaber with the power to one shot almost every enemy in the game, shoulder mounted flamethrower that makes armor fall of of demons,a gun powerful enough to make the navy's railgun look like someone threw a nerf dart,the bigger version, that makes the previous gun look like my dog tried to throw a grain of sand at the beach, in an attempt to damage the beach, a double barrel shotgun with a heat seeking grappling hook on it to be even better,and also why the heck not,a futuristic crossbow,grenades,cold grenades, a plasma gun, a gun made from heaven, to use against hell, a chainsaw with the ability to create rainbows of ammo to sprout from enemies once cut open,a wrist mounted super knife,the ultimate death stare, and a suit, powerful enough to be as strong as my kindle fire,which is extremely strong, all the weapons are essential for this man to be an unstoppable force who doesn't need to eat,sleep,drink,and he probably doesn't need to breath, and has essentially made this his job, and will be his job, for eternity, and he enjoys it, because he gets to murder fireball throwing monsters,a demon, that has enough armor on his face alone, to survive a direct hit from a rocket, peter griffin with rocket flamethrower arms,spiders with plasma guns on them,a super demon tank,a skeleton that has memes about it playing the soundtrack on a trumpet,a demon that spawns in more demons just to make your life horrible,and zombies, defeating them all so that you can crush the final boss that much easier, and just so he can stay alive, you have to damage the enemies just enough so that you can do a finish him move from mortal combat, and burn them alive so that you can get armor, and you do all of this while listening to heavy metal, just to make you feel that much more awesome,you also decided to start doing this because they killed your pet rabbit,so you went on a never ending rage fest, purely to avenge her, and your entire platoon of marines died while you were the only one who survived.
Yep, that's one sentence. Good luck and have fun reading it, and congrats if you already did.(Also this game is the Doom Eternal.)