RWBY: Oscar the gamer

Oscar walked through the portal of the dungeon key had open, this time the Dungeon Location was Mr Oobleck class room, which was weird, as he walked he saw it was one to replace of the class as he heard something he rolled our of the way as he saw Grimm spider.

Ding!

[Name: White Legs

Rank: C

Level 30]

Oscar just pulled out this Gun-Sword Crimson Fang. "I am already Level 50, seeing it a Grimm".

Oscar then used [Light spear] as it hits one of the spider leg, as he used a few more times

Ding!

[Skill leveled Up

Light spear - Level 3]

Oscar then used shadow clone, as two more Oscar came out, one then used a [Fire Ball] and the other a [wind Slash]

Ding!

[Skill Shadow Clone levels up level 4]

Ding!

[Skill Fireball leveled up: Level 14]

[Skill Wind Slash leveled up: Level 11]

The combined attacks of the three Oscars—Light Spear, Fireball, and Wind Slash—struck the White Legs Grimm spider, causing it to stumble and screech in pain. Oscar's clones quickly adjusted their positions, keeping the spider distracted while he himself moved in for a closer attack.

Oscar raised Crimson Fang and activated its Gun mode, firing enchanted bullets at the spider's core. Each shot landed with precision, and the spider's movements became slower, its limbs twitching erratically.

Ding!

[Weapon Fusion: Crimson Fang - Level 4]

[Crimson Fang: Blood Reaver skill activated. HP restored.]

Oscar smirked. "This is too easy. At this rate, I'll level up even faster."

As the last of the Grimm spider's legs crumpled, the creature let out one final screech before collapsing into a pile of blackened ash.

Ding!

[Monster defeated: White Legs

Experience gained: 800 XP]

Oscar turned to his clones. "Good work, guys. Let's keep going." The clones nodded in unison, following him deeper into the dungeon.

As they ventured through the eerie halls of the dungeon, Oscar couldn't help but feel the strange atmosphere in the air. It felt like something more dangerous was waiting for them, just beyond the next corner. His system had warned him of higher-level Grimm monsters appearing, but he was confident in his abilities.

Just as they entered a large chamber, Oscar's eyes narrowed as he saw a massive shadow looming in the distance.

Ding!

[Boss Encounter: Shadow Wyvern]

[Rank: B]

[Level: 50]

Oscar's heart raced, but he steadied his breath. "Looks like we have a challenge. Let's do this." He readied his Crimson Fang once again, the shadow of the wyvern looming larger as it drew closer.

"Clones, get ready!" he shouted as the battle began.

The Wyvern dived down but Oscar moved out of the way, as then he kicked the Wyvern as it hit the wall, as he released the hall way looked like the hall way or Beacon.

The 1 Clone Oscar then spoke. "Take this".

As the first Clone jumped onto he back and used his own clone version of Crimson Dang into one the wing, as the other Oscar used [Turn Undead] as the Shadow Wyvern screach in pain.

The Shadow Wyvern then sent a blast of Wil what can only be described as Black Energy, Seeing this Oscars used [Shadow Step] to moved out the way, as he used Crimson Fang to cut one it's Wings Of.

Ding!

[Crimson Fang: Blood Reaver Skill activated. Hp restored]

Oscar then summoned two [Light Spear] as he slammed into the Shadow Wyvern as it screamed again

Ding!

[Skill Leveled Up

Light Spear - 5]

Then the second Clone also Shadow travel as he put his hand in the Wyvern and used [Water Blast] as the water spell as the spell fill the Wyvern with water as then Peace used [Freeze Dry] as the Insides of the Wyvern was now frozen, as then he cuts the Wyvern head of with the light spear, as the Wyvern turned into ash.

Ding!

[Boss Defeated: Shadow Wyvern]

[Experience Gained: 5000 XP]

[Level Up! Level 51 → Level 52]

Oscar let out a deep breath as the Shadow Wyvern disintegrated into ash. His clones faded away, their job done. He looked around, noting once again how similar the dungeon's hallway was to Beacon's.

"This dungeon is weird," Oscar muttered. "It looks like the school, but twisted."

He took a moment to check his system notifications.

Ding!

[Dungeon Progress: 45% Cleared]

[Dungeon Boss Defeated: Secondary Boss – Shadow Wyvern]

[Main Boss Remaining: ???]

Oscar frowned. "A main boss? That means there's something even stronger waiting for me."

He glanced at Crimson Fang, the blade humming slightly as if resonating with the energy of the fallen wyvern. "Blood Reaver is really coming in clutch," he noted, feeling his health fully restored.

With no time to waste, he advanced deeper into the dungeon. The eerie resemblance to Beacon continued, making him uneasy. Classroom doors stood slightly ajar, whispering echoes of nonexistent students filling the space.

Then, a new notification popped up.

Ding!

[Warning! Strong Presence Detected Ahead!]

Oscar stopped walking, gripping his weapon tighter. "Well… this should be fun," he said sarcastically, stepping forward to face whatever awaited him.

As the monster came near, Oscar didn't even see what it was, as he just used a point blank [Fire Ball], with that with of a [light Spear] as an Big Explosion happened as it sent him back as the window was broke opened, the walls was destroyed as he looked around what ever it was he killed it.

Oscar looked around. "That was easy".

Oscar then started to walk, after a while he arrived to twisted version of Ozpin Office, if the Boss was anywhere it was here, he opened the door, as he saw someone seating on Ozpin chair was well what can only be described as a creature.

It skin was black as night, as it had cracks on it's body which looked like lava, they were glowing, glowing orange eyes, one gaint sword on its back and second on its waste, a burned red cafe, as something was to its waste, as it has Lions head with mains as will

Ding!

[Dunegone Boss: The Old Knight

Rank: A+++

Level 50]

Oscar's breath hitched as he read the system notification.

"A+++ Rank?" He muttered. "That's the highest-ranked enemy I've faced so far… in a normal dungeon"

The Old Knight slowly stood up, its glowing orange eyes locking onto Oscar. The heat radiating from its body was suffocating, and the sheer pressure of its presence made Oscar's instincts scream danger.

The creature grabbed the giant sword from its back, the blade crackling with molten energy. Then, with a slow yet deliberate movement, it rested the second sword against its hip, clearly experienced in dual-wielding.

Oscar immediately summoned his clones. Three copies of himself materialized beside him, each gripping Crimson Fang.

"Alright, let's do this."

Ding!

[Battle Start!]

Before Oscar could make the first move, the Old Knight vanished in a burst of speed, reappearing directly in front of him.

SLASH!

Oscar barely managed to block with Crimson Fang, but the sheer force sent him crashing through the twisted office wall, skidding across the ground. His clones attacked in unison, one using [Shadow Spear], another using [Light Spear], and the last casting [Water Blast].

The Old Knight casually deflected the attacks, cutting through the spears and dodging the water spell. It then dashed toward one of the clones, swinging its sword.

BOOM!

The clone exploded into pixels, its body unable to withstand the attack.

Oscar groaned, forcing himself up. "Okay… not gonna lie, this might be a problem."

The Old Knight turned toward him again, its molten cracks glowing brighter as it raised its sword.

Ding!

[Boss Skill Activated: Molten Cleave]

The blade ignited in searing flames, and with a single downward swing, the entire floor beneath them exploded into fire.

Oscar barely managed to use [Shadow Step] to avoid the attack, appearing behind the knight. He immediately thrust Crimson Fang forward, aiming for the cracks in its armor.

"Take this!"

SLASH!

The blade connected, but instead of piercing through, it only chipped a small fragment off the knight's armor.

Ding!

[Minimal Damage Dealt!]

Oscar's eyes widened. "Oh, come on!"

The Old Knight suddenly spun around, swinging its second sword at him. Oscar barely ducked, but the sheer heat burned part of his sleeve.

The fight was only getting started.

Oscar then blocked another Sword as there sword clash as spark flyes, as then Oscar kicked the knight with all powers as then it hits the wall, as then Oscar [Shadow Step] as then he grabbed the Knight Face and slammed him through the wall, as the Old Knight was then sending flying through the other wall.

Oscar then spoke. "System current Strength Stats".

Ding!

[Strk Stat: 220]

Oscar then went to his Inventory as he pulled out the Skin of Cleric Beast as he put on the Leather Jacket

Ding!

[Skin of the Cleric Beast, this increase host speed by +5, Strk +5, stealth+5 while this item is equipped (It looks like leather jacket)]

Oscar then pulled out the Grimm Human Hybrid transformation mask. "Time to get more serious"

Ding!

[Grimm Human Hybrid transformation Actived Host, this transformation is incomplete. Its power will increase as you level it up. Current enhancements include: Strength +20%, Speed +15%, Regeneration +10%. Be cautious—prolonged use may cause strain on your body. ]

As then a blast of energy came out of Oscar and will this time it didn't heart to transform, he screamed as his body was turned pure black, his clothes fused with his body, as then two wings came out of his back, as his feet was covered by bone like armour, as so did his hands and finger which now had claws, his face has a broken Grimm mask as he has red eyes, a tail came our of his back which had spiked

Oscar grabbed Crimson Fang, as his Grimm eye sa the Old Knight Get up. "Bright it On".

The Old Knight's glowing eyes locked onto Oscar's transformed state, and for the first time, its molten aura flared in response. The twisted office around them trembled under the sheer pressure of their combined presence.

Oscar flexed his claws, feeling the raw power coursing through his body. His muscles were denser, his reflexes sharper, and the Grimm instincts within him screamed for battle.

The Old Knight let out a deep, guttural growl before suddenly charging, both swords glowing with intense molten energy.

BOOM!

Oscar vanished with [Shadow Step], reappearing behind the knight mid-air. With a snarl, he slammed his foot into its back, sending it crashing through the wall. The twisted remnants of Ozpin's office crumbled under the impact.

Oscar didn't give it a second to recover. He dived forward, using his new winged agility to close the distance almost instantly.

SLASH!

His clawed hand raked across the knight's exposed shoulder, leaving deep gashes. Unlike before, his attacks were actually doing damage!

Ding!

[Significant Damage Dealt!]

The Old Knight let out a distorted roar, its molten veins pulsing violently. Without warning, it swung its sword in a wide arc.

Oscar ducked, his new instincts guiding him as the scorching blade barely missed his head. He retaliated by twisting his body, using his tail to WHIP the knight's leg out from under it.

CRASH!

The Old Knight hit the ground, but before Oscar could land a finishing blow, the knight thrust its sword into the floor.

Ding!

[Boss Skill Activated: Eruption Slash]

A massive explosion of molten rock burst from the ground beneath Oscar.

BOOM!

Oscar was sent flying back, crashing through the wall of the warped office. His wings flared out at the last second, stopping his momentum.

Smoke and debris filled the air, but through the haze, Oscar saw the Old Knight rising to its feet once again.

Its molten cracks were brighter than ever, its armor regenerating, and now, both swords were engulfed in flames.

Oscar exhaled, his breath misty from the sheer heat of the battle. His claws tightened around Crimson Fang as he bared his fangs.

This fight wasn't over.

It was just getting started.

As the Old Knight then come near Oscar, Oscar then used [Fire Wall] as the old Knight went through it, we it stopped as it talked as then Oscar used [Earth Pull], as he dragged the Old Knight in the ground, as Oscar flyed up and landed down with Axe kicked breaking the floor as the old Knight fell through the floor, as it hit the, as then Oscar looked the second sword dropped, as he picked it it up, it was the Claymore, but it was ethr other one.

Oscar lookee at as she spoke. "So what can you do".

As then he heard a Roar as he heated climbing, as hand came up from trh ground grabbed Oscar leg and dragged him to the ground, as Oscar was falling he used [Earth Spike] as to it the Old Knight as it stabbed one eyes as Oscar kicked himt o hit a wall, as Oscar started to fly using his Wing's.

As Oscar hovered in the air, he examined the Claymore in his hands. The moment he gripped it, a notification popped up.

Ding!

[Weapon Acquired: Infernal Claymore]

Type: Greatsword

Attack Power: +200

Special Effect: Absorbs heat and converts it into explosive slashes

Skill Unlocked: [Infernal Cleave] – A devastating downward slash that releases stored heat energy upon impact.

Oscar's Grimm-like red eyes gleamed. "Now this is interesting."

The Old Knight growled, shaking off the Earth Spike that had impaled its eye. Molten lava-like energy dripped from its wound as it lunged forward, both arms raised, ready to cleave Oscar in half.

Oscar flapped his wings, propelling himself backward. His new Claymore pulsed in his hands, the blade absorbing the surrounding heat.

He grinned.

"Let's see how you handle this!"

Oscar swung the Infernal Claymore with all his might—

[Infernal Cleave!]

The blade glowed intensely before releasing a massive wave of fiery energy, tearing through the air and slamming into the Old Knight's chest.

BOOOOOOOM!

The explosion sent the twisted remains of Ozpin's office crumbling, the walls shattering, and flames erupting in every direction.

Oscar landed, sliding back from the force of the attack. He watched as the Old Knight staggered, its armor cracked, molten veins flickering, and one of its swords completely shattered.

Ding!

[Enemy HP Critically Low!]

Oscar smirked. "Looks like I'm winning this fight."

But then—

The ground trembled.

The Old Knight let out a deep, guttural roar, and suddenly, the lava-like energy in its body surged violently. Its molten veins turned from orange to bright crimson, and its remaining sword ignited, burning brighter than ever before.

Ding!

[Boss Skill Activated: Final Awakening – Infernal Wrath]

Oscar's eyes narrowed.

This fight wasn't over just yet.

To be continued

Hope people like this Ch and give me power stones and enjoy