In the World of Sword and Magic as Space Marine

The powerful psychic ability of the Greater Daemon made everyone unable to move the moment it appeared into this world. Unable to do anything, William desperately searches for anything from his new loots to see if it can help him.

From defeating the Blood Duke:

[Thunder Hammer x1: A two-handed heavy melee power weapon of the Space Marine. By emitting the energy field within the hammer's head, when struck to its target, it releases powerful and concussive force at once to devastate the enemy.]

[Storm Shield x1: A power shield used by the Space Marine to protect from heavy projectiles and enemy melee attack. Equipped with an internal gravitic energy field generator which makes powerful blows ineffective. Requires a short time to recharge.]

From defeating Zombie Dragon:

[Summon Order (Militarum Tempestus Scions) x1: As elite soldiers of the Imperium of Mankind, Tempestus Scions are the Special Forces of the Imperium and are capable of various types of missions including raids behind enemy lines. Summons 50 Storm Troopers of Tempestus Scions equipped with Carapace Armour, Omnishield Helmet, advanced lasguns, and grenades.]

[Adeptus Astartes Drop Pod x1: Drop from the low orbit, Standard Drop Pod carry 10 Adeptus Astartes and 2 Techmarines (Same Chapter as the Player's) equipped with standard bolter, bolter pistol, chainsword and a combat knife. Will follow the Player as he will be placed as Battle-Brother in Command.]

From defeating The Masque of Slaanesh:

[Bane of Chaos (Purity Seal) x1: A Purity Seal that gives the user resistance against Chaos corruption.]

[Dreadnought Drop Pod x1: Drop from the low orbit, Dreadnought Drop carries one Dreadnought from the same chapter of the player. The left hand is armed with twin-linked M34 autocannon with armor-piercing and standard round. The right hand is a power fist and has a heavy flamer under the arm. The Dreadnought is also equipped with extra armor plating and mounted with a launcher to fire smoke grenades and short-range mortar rounds.]

The moment William saw the purity seal, he equipt the seal which allowed him to move again and stand up to fight against the Greater Daemon. Still, because of the powerful psychic ability of the Keeper of Secrets, William decided to summon only one unit that could help him as the rest would only be immobilized the moment they got summoned. Using his helmet, William dropped a 30 tons (27,215.5 Kg) Drop Pod right on top of Keeper of Secret.

Boom!

With the heavy impact, the drop pod hit the Greater Daemon's head which stunned the daemon underneath. The drop pod opens and a huge Dreadnought comes out from it, scanning the battlefield including soldiers and William.

"Brother, I have arrived. I serve now...and Forever!" The powerful mechanical voice said out loud and walked out from the drop pod. As Dreadnought steps away from the metal platform, the Greater Daemon starts to remove the heavy metal pod above its head after recovering from the stun. When the drop pod was removed, Dreadnought saw what was behind him as it quickly recognized the enemy.

"A Heresy, be judged," Within a second, Dreadnought open fire his left arm's autocannon, unleashing devastating firepower of the heavy ballistic weapon at the Greater Daemon. Seeing this, William went into action as he drew his plasma rifle from his inventory and fire at the Greater Daemon. The dust began to engulf the Keeper of Secrets which blocked the visual of the target, but for William and Dreadnought, they continued to fire their weapons as they could see the Greater Daemon through their targeting system.

'Can't take chance, must kill it before it could regain its posture,' William thought to himself as he didn't want to allow the Greater Daemon to have a fighting chance. Just as William finishes his thought, from the dust cloud, Keeper of Secrets charged through with metal plating of the drop pod its hand, using it as a shield.

"Brother, evasive maneuver," William gave the command to Dreadnought but the Greater Daemon was too quick to evade as Dreadnought got hit by the metal plating and pushed back by the daemon.

"You can't stop me from doing my master's bidding, human" Keeper of Secrets said to William while throwing the metal plating away. Just as William is about to fire his weapon, the metal fist smacks the daemon's face making the daemon step back a few steps away. Walking forward, Dreadnought widened his feet and the engine in the back began to roar as smoke rose from the exhaust pipe.

Seeing that Dreadnought is still standing, daemon charges forward at the Dreadnought as the walking tank of the Imperium receives the attack head-on, not budging an inch. Now, two titans of the war and battle are in close combat as both sides push each other in the battle of strength.

"Switching to melee," Dreadnought uses his right arm to punch the daemon's face again, but the daemon quickly recovers from the attack and uses its third and fourth arms (Which are flesh blades) to try to stab the Dreadnought. Seeing the danger, William uses his jetpack to jump high above the daemon's back and use his new power weapon, the Thunder Hammer to attack the daemon's head.

The blue energy of powerful force unleashed upon the Keeper of Secrets' head as William's hammer made contact with its target. The powerful blow staggered the daemon enough to stop the attack and it gave an opening for Dreadnought to reposition its power fist to fire flame from a heavy flamer attached under the fist.

The fire covered the Greater Daemon as it began to scream in pain. Seeing possible weakness, William dropped his Thunder Hammer to pull out his heavy flamer from the inventory and fire at the screaming daemon. The continuous flames from Dreadnought and William burn the daemon but just as William starts to think they were winning, the daemon starts to swing its duel swords wildly. One of the swords stabbed William, wounding him as the blade cut through power armor and appeared in his back. As daemon continues to swing wildly, William gets thrown from the sword and to the battlefield near the fight. For the Dreadnought, he barely dodges bone blade and continues his attack adding autocannon.

The Greater Daemon receiving heavy firepower from the Dreadnought decide to change tactics by using superior speed. With swift feet, the Keeper of Secrets begins to dodge the attack while attacking the blind spot of the Dreadnought. The tide of the battle quickly changes as Dreadnought starts to get pushed back and receives a powerful slash attack. Still, thanks to the heavy metal plating, Dreadnought didn't receive critical damage to its mechanism but is unable to make an effective attack on the daemon.

Meanwhile,

William is on the ground, laying on his back with a huge wound in his stomach as his gene-seed does everything to keep him alive. Now broken and unable to move, William's power armor locked in place, making William watch the battle helplessly as a battle between Dreadnought and Greater Daemon continues. Slowly, William loses his consciousness as darkness slowly pulls him into a void, ultimately leaving his body.

[Where am I? Did I just die?] William asks himself as he realizes that he is still in the body of a Space Marine but without his power armor or weapons. Around William, the place began to dim without actual light sources as various humans and other races started to appear in distance. A closer look, William saw those people look rather transparent and wandering around as if they are lost or don't know that they are dead.

[I'm in the afterlife, I died after all. Why am I still in Space Marine's body?] William began to think but before he could get any answer a man in a full plate of armor and carrying a sword appeared in front of William.

[You are in the wrong place, my friend. I didn't retrieve your soul from the material plane, rather something dragged you here. Someone or something wants your soul, enough to disturb the natural order. Sorry, where are my manners? I'm Kelemvor. The Lord of the Dead and Judge of the Damned.] Kelemvor said to William as he was about to explain William's situation. Suddenly, a dark purple portal appears out of nowhere and four different hands come out, reaching William.

One of the hands, the red and bloody hand changes its direction and attacks Kelemvor. The Lord of the Dead defends himself as the red hand continues to attack him but eventually, the hand grabs Kelemvor's body and crushes him like he is nothing but a bug. As this was going on, a green rotten hand, blue thin hand and purple feminine hand, pulled William against his will and to the portal which disappeared from the plane of the souls.

Between the Forgotten Realm and Immaterium,

[You should have joined us, mortal.] A menacing voice said to William as other voices joined in.

[Now, you will serve us just like your brothers. You will fight day and night against my minions.] An angry voice said as a bloody hand grabs William.

[Your fight against my servants was entertaining. Maybe I will keep you like my collection, just like Fulgrim.] A feminine voice came from the purple hand.

[You will be my new experiment, you won't escape this time.] A sickly voice from the rotten green hand said to William while William struggles to free himself.

William, now in big trouble, continues to fight back but this time it was hopeless as he is now fighting the material form of the four Chaos Gods. Unfortunately, no voice came to save William this time as his soul is now traveling through the warp, heading to the Realm of Chaos.

[Shit, this is it. I'm about to enter the 40K universe.] William thought to himself and about to give up all hopes when a powerful bright light came out of nowhere and vanquished the four hands of Chaos Gods, freeing William. William, seeing hope, embraces the blinding light which helps heal his mind and purify the corruption of the chaos. Soon, William lost his consciousness but before that happened, he heard a voice he didn't recognize.

[I shall reforge you in the fire of my will. You will be the shield and sword against the terror. Now, go!]

The last word from the light woke William as he opened his eyes to see that he was now standing on his feet and able to move freely again. Looking around, William saw soldiers, including Prince and other knights, now on their feet, free from pain and suffering. The battle between Dreadnought and Keeper of Secrets paused as if something is blinding them.

Stepping forwards, William finally realized that his power armor is different as he is now wearing the older but much more advanced power armor of Black Templar and holding a two-handed black power sword.

"The Battle-Brother has returned from the brink of death. Now, chosen as Champion of the God-Emperor." The dreadnought said out loud in a mechanical voice as Greater Daemon took a few steps back as light generated from William began to burn its skin.

"Wait, I'm WHAT?" William said to himself as everything around him purifies due to the blinding light removing corruption of the Chaos and healing the allies around him. The Emperor's Champion of the Black Templar enters the battle against Chaos in the New World.

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