Here's the corrected version with proper paragraphing, spacing, and punctuation:
In a kingdom torn by centuries of war, young King Edmund of Wessex rises to power amidst whispers of rebellion and looming threats from the descendants of the infamous Viking warlord, Ragnar.
Though peace reigns briefly, it is fragile-beneath it, old grudges stir and foreign allies plot revenge. Edmund, brave but untested, must navigate a realm where treachery hides behind loyalty and every handshake could mask a dagger.
As Wessex rebuilds from past wars, mysterious attacks on border villages point to an emerging alliance of northern invaders and traitorous Wessex lords. Among them are the cunning Ragnar children-heirs of the great Viking, each one fueled by the desire to destroy the kingdom that defeated their father.
The kingdom's safety begins to crumble from within, as Lord Wulfric, once trusted, plots Edmund's assassination and paves the way for a new order.
Edmund, aided by his loyal captain Osric and the skilled archer-spy Lady Aethelwyn, uncovers a secret conspiracy beneath the castle armory. With courage and swift justice, they bring the traitors to light, but not before learning of a far greater threat-Erik the Pale, Ragnar's most ruthless son, is marching south with a host of battle-hardened warriors to burn Wessex to the ground.