The bright sunlight reigning over the skies above illuminated the world.
Is the sunlight or the sun reigning over the skies above? How about, "The sun, reigning over the skies above, illuminated the world" Also, find an adjective for "world" that connects it with the rest of the paragraph. Like "peaceful" or something.
The colours of the landscape were bright and vivid. From the overwhelming green of the grass to the yellow of the delicate buttercups dotting the land.
Either change the first period to a comma or add the first sentence to the end of the second. Both of these will make it into a run-on sentence, though, so condense a bit.
Fourteen men led by a tall man in silver plated armour destroyed the beautiful landscape with their footsteps as they made their way toward a cave by a riverside.
Men man. Footsteps are more of an abstract than a thing capable of destruction.
How about, "Fourteen soldiers, led by a tall man in silver plate armour, trampled the serene landscape as they made their way toward a cave by a riverside."
IMO, 'serene' makes the intrusion of the men more offensive than 'beautiful'.
The man in silver armour, along with four others of the front 6 menWhat's special about the other two front men? in the pyramid formation were knights, the others were travelling slayers with great skills in various fields. All of these men had devoted their lives to destroying the very<unnecessary creatures they were about to encounter. They had been preparing for this day use hyphens - this moment - their entire life. cutNo more than/cut ten feet from an old door of rotting wood at the entrance to the cave the man in silver armour held up an open left hand and stopped.
How about, "Ten feet from an old wooden door at the mouth of a cave, the silver knight help up his left hand to signal a halt."
The rest of the formation stopped behind him. He pointed to the door and made use of his perfectly enunciated, eloquent voice “Mr. Gray. If you will?”
Mr Gray, a slight and grey-robed man at the back of the formation walked around the group of men and up to the door. Crouching by the wooden doordoor door he took two cloth satchels from the multitude tied around his waist. Of the many different colours the two he selected were black and bright orange.
How about, "Crouching, he took two satchels from his belt. Of the many widely coloured bags, the two he selected were black and bright orange."
I'm too tired to do any more. I hope you are learning from some of these suggestions, or else my advice won't really help you.