Hero's welcome but with a heavy heart (I'd story)

Large massive doors open to a city of people cheering for knights coming home. But instead of swords, they fought with black powder rifles and guns. The soldiers were coming home from a long and hard war fight against the creatures of the darkness. The commander lead his troops into the city with his hands in the air yelling in good spirits that they were back from the fight but one of the soldiers in the 19th row was quiet. He looked around scared that something was going to happen. He said to his self in his head that the people didn't know what happen out there. That good man lost there lives and here we are being praise like we win the war. He looks in side his bag on his horse and sees the pocket watch his brother in arms gave him to give to his wife in case he did not make it. He thinks back to that moment. When it all fell apart, my name is Sir David of the 441st troops of Xive our duty is to service and protect the people of the city and lands from the darkness. 14 weeks we were out there fighting for survival. Not knowing if we would see the light of the next day. I guess I need to go back to make sense for all. We all lived in peace on our world until a meteor hit and gave us a new way of life to live with metals and medicines with the spores that was given within the meteor. But we did not know that where the meteor landed would break a unknown ancient seal that would release hell upon us. It all started with People disappearing without a trace but than mountains of bodies started to appear with the life sucked dye from them, just bones and gray skin plus the eye sockets were empty. So the king and the queen with there caring hearts asked the people to come to the city to be safe. I was 6 years old when my mother and father plus my sister were killed by the abominations. I swore to kill them all but I did not know there was something more horror able out there. There in the fields where our farms were was a large massive gate it was where all this started. They attacked at night but by day we rested but when will it be over I said to myself that day. It was a endless war because we would fight for the rest of our lives. I am 36 years old now and trying to understand what I saw out there. We were asleep with people keeping watch as the sun when down. When the last light faded they came flying out of the darkness like ants coming out of a mount. 7000 soldiers against a unlimited odds. We fought with our last breathes, we never stood a chance. They came throwing spears made out of bones and using die people as hammers and shields. Some were even riding giant monsters and with just one swing wiped out groups of soldiers. My childhood friend Sam looked at me on the battle field about 12 steps away. I yelled to him to move to keep fighting but it was like slow motion. He was scared out of his mind wanting it all to stop, for it to be over. He was stuck three times with spears. I run over only for him to hand me his watch and hear his last words. He said to tell her he loved her and tell her he was scared. Than it happen the sky open and it was day again but how? The creatures screamed as they run for the darkness. The gate shatters and something strikes the ground from the sky. It was a large black flame and out of it reached black claw arms pulling a pure white skin being with jet black hair and yellow eyes. He screams and runs lighting fast with a blade he summons killing creatures and soldiers by cutting them in two or grabbing them to tear them apart. He turned and started to walk slowly towards the troops. His eyes had evil intent, a soldier fires at him and the being side steps and warps beside the soldier scaring him before he cut him across the chest. Blood sprees all over than speaks to us saying his name is was I'd and that he was here to grant us our last day to live. I'd took his sword and dragged it on the ground and out of it came smoke demon hounds that had fire for eyes and drool acid they took off running towards the troops. The troops fire there black powder rifles and guns I'd just spins his sword blocking while other bullets split the demon hounds in to two more demons. I'd strikes the ground and transforms into his abomination form. A upper part of a smokey demon that when it reached out anything in its shadow rotted away. I'd swings killing 170 here and than punches the ground killing 350  more. I'd than pushes his fingers into the ground only to have spikes appear any where he wanted. The commander was pissing himself as they retreated back to the city. I'd smiles and killed only to allow a 150 to survival to tell the tale that there is something more to fear than the darkness. One of the soldiers tapes Sir David on the shoulder and he comes back to realty still scared and trying to keep it together. They pass a alley and Sir David rubs his eyes only to see his fear in the darkness in the alley. I'd Was standing there smiling as he puts his finger to his lip to say shhh. Sir David rubs them again to see him gone after. The troops come upon the center of the city where the king and queen wait to hear the report. After hearing the report from the commander the king speaks out to all the people saying that the darkness was defeat and that the soldiers that gave there lives did not die in vain even those it was a high price to pay. The commander says we were victories. Sir David says to the other knights that it is not true, that is not what happen. They just tell him to shut up and keep it quiet. Than the king says let us bow our heads in a moment for the fallen. It becomes quiet but out of no where you hear clapping and a laugh. The queen says who dares to be rude for the dead? Some of the people step aside as a hooded being walks up. The king says reveal your self and the hooded being removes its hood. Sir David gets a bad feeling in his heart that this was it. The hood comes off showing I'd smiling with a follow up I am here!! I'd says what a beautiful moment you have here. The king says who are you? I'd says I am your peoples calling that holds the blade at there throats. The queen says seize him but when the guards get close I'd raise his hand and boom the guards turn to dust. The queen says your the devil and I'd says no he wishes to be me. Sir David screams he is the one that all most killed us. I'd looks at him saying aww you notice well I did not kill you all because I wanted to toy with you all to finish the job I started with more people to play with. The king yells kill him and I'd yells sit your ass down and listen. I'd than swings at the air and the king is slapped in the face forcing him back into his chair where the arm rests change in to snakes and wrap around him. I'd says now let me get this straight, did I hear correctly that your troops are taking credit for something I did. WOW I must say that you are the most stupidest motherfuckers to ever step in to the wrong mans path. Well enough talk you people lived long enough time to pay with what is owned. I'd snaps his fingers and the ground shakes as three large massive spikes break through the surface of the city in different areas. Out if the spikes came demons, skeletons and banshees. People run trying to hide but there is no where to go as people are torn apart. Organs line the streets as a women grabs hold of I'd begging for him to release her and her family but I'd looks at her serious and swings his crawl hands cutting her head off. I'd walks up to the king and queen as she was trying to free the king. I'd says what do you think of your fair city now. I'd grabs the queens head and slams her in to the chair next to the king and she is tied up by a rope that appears. The queens says you will die, someone out there will kill you. I'd says oh please you are not Caim my better half so don't try just die. I'd draws his sword and points it at her stomach and says I see you are with child. The king turns his head in shock and screams as I'd thrusts the sword through her and than pulls to the left cutting her in two plus also taking the kings head off as well. I'd dances around and listens to the screams of the city in panic and pain. He jumps to a rooftop and reaches out his hands and uses his powers to lift small and tall builds off there foundations and throws them at others and people running. I'd says well times up I have wasted enough time here. Out of his back comes white wings and he lifts off to the sky. Five miles up in the air he points to the city below and says bye-bye. 100,000 gone in a blink of a eye while in Caim's world he falls to his knees hearing the peoples screams as they were wiped out. I'd says what do you think Caim? Sir David awakes outside the city that is in ruins now. He says how did I survival? I'd appears behind him and Sir David screams why? I'd grabs Sir David by the throat while holding him up off the ground and shakes his head and says I did it because I enjoy it. You my friend are going to help me from now on. Sir David says why should I? I'd says you don't have much of a choice in this because I have something you want. Sir David says I don't want anything you have. I'd shakes his head again and says you still don't get it I made it where you can't die unless I give it to you. So help me or walk for the rest of this time this world has forever with it never ending. Sir David falls to his knees and cries as he drops the pocket watch.