Well hello there, welcome to another story by Grimmjow-sama! This idea only popped into my head when I was re -reading Overlord which is a good SI fic where the MC was reborn as a Grimm, well lets get into the story.

Disclaimers:

I do not own RWBY and it belongs to Rooster Teeth and to the lovely man, Monty Oum.

Chapter One: What the Actual Fuck!?

OW! Why the fuck do I feel like I got my body slammed into a truck and the last thing I saw before I black out and got myself into a empty void was a steel rod pierced into my chest and blood on the ground. I am dead aren't? *Sigh* Life was fun while it last it...

Maybe I might meet my twin who basically died after he was born, wonder hows he been doing in Heaven though.

Before I could make another thought, a glow in the distance catches my attention ahead of me, okay it wasn't a glow, more like a growing expansion of light that is getting bigger.

"What is th—OH SHIT!" I shrieked as my eyes gone wide while I screamed in realization as its engulfing my whole body, trying to resist the sudden pull that is leading me towards the expanding light, only in the end to cause me to lose consciousness once again.

I open my eyes to find myself surrounded by trees. Trees? Why am I in a forest? From the whispers of wildlife to the rustling of leaves and branches as a slow dance of wind passes me; it was a pretty dead giveaway. Checking my surroundings I found my self in a forest with a huge lage in front of me.

Did I get reincarnated?

If I did, like all fanfictions I read that is related to reincarnation, most of 'em should be in a hospital and meet their new parents and why am I in a forest? That dosen't make sense to me.

I raised my arm and try doing some stretching, before I could try to do it I saw my arms and it wasn't my own arm. It was a arm it looked like it was long enough to reach my legs and my new strange arm only had four fingers and there were claws on it.

I have a strange feeling that my arm isn't the only thing that is change, I looked at myself and I saw was my body and it made my brain almost shut down immediately in pure shock of the revelations before me.

My new body was in black skin, with bone-like plates covering my body at certain places like armor. Is this shit gonna be like that fic named "Overlord" where the MC got reborn as a Beowolf? Good thing I ain't a freaking Beowolf, that type of Grimm is weak as shit. Am I a Nuckelavee? I have long arms, nah if I am a Nuckelavee then why do I have legs instead of a horse? Imma just go check the river and see what type of Grimm am I?

Walking slowly at the river to see my reflection and I saw was a head that is really familiar to me even it had the Grimm mask like any Grimm but I can't help it that my appearance looked like a certain character from a video game and I even had black on the back of my head.

"Holy sh-" I spoke and vocals is more familiar to me, how the fuck can I speak? Grimm don't speak and neaither can I? What the hell and why the fuck am I a Grimm version of motherfucking Merkava aka Noodle Arms from Under Night In-Birth!? Is this for your doing you are giving me, Author!?

Well fuckidy fuck fuck, I've been in reincarnated into the RWBY universe.

Not as a human or Faunus with the potential of wielding badass gunblades. I'm not even trying to apply to Beacon Academy and listen to fucking Ozluminati's bullshit, I was thinking about becoming vigilante and convince Roman to betray Cinder and make a plan to kill her though.

I've been reincarnated into a creature of Grimm, a Grimm version of Merkava, and that is fucking awesome!

If you guys are saying; "Why are you excited about being a Grimm?". Duo the fact that I am a Grimm Merkava, I am going to bitch slap everyone with the infamous move of his which swinging his arms randomly.

I might fucked up Ren's mind and rage if I was a Nuckelavee when I wake up at Emerald Forest (if possible that I am in Emerald Forest).

I am going to fucking train my ass everyday, even if I am a Grimm I need to prepare for the Fall or I would be DEAD.

Welp, time to train my ass and get used to my new body and I wonder If I can turn my arms into tentacles , having wings in my arms and stretch my arms reaaaaaally fucking long just like how Merkava did though, maybe I could breath fire just like how I saw him use that shit in the game.

2 Weeks later...

It's been 2 weeks since my reincarnation as a Grimm. I discovered some of my abilities after training my ass off, good thing Grimm don't require food but I always drink water even though I am not thirsty. I drink water to get rid of the dryness that builds up in my mouth.

Turns out that Grimm had night vision, I always wondered what night vision was like and it was beutiful though. Staring at the skies of the night was beautiful even with night vision on, another power which my theory of breathing fire was correct but its not gonna be like a flamethrower type pf fire breath. It's more like a fire breath version of a Ki Blast from Dragon Ball. Arm stretchig, tentacle turning arms and wings are confirmed, yep Grimm Merkava confirmed.

Like all Grimm, I could sense negative emotions.

I have yet to come face-to-face with a human or a Faunus, let alone a Huntsman, but the day will eventually come. And when it does, I am going to avoid them or run away if those guys won't leave me the fuck alone. I kinda stumble into a Huntsmen who was basically killing alot of Grimm and then head back wherever he was without getting notice.

3 days later that I found a ruined village and saw motherfucking Raven Branwen and Vernal with the rest of the Branwen Tribe raiding and killing alot of people. HELL, everyone wasn't spared and the children shared the same fate as their parents which sickens me that her and her fucking tribe wasn't even bothered about killing children and I saw one guy kill a baby, a fucking baby in front of the infant's parents...

Anger was boiling inside of me on how could this sons of bitch be so cruel... Screw that "The weak die, the strong lives" bullshit, its like motherfucking Esdeath saying that shit in Akame Ga Kill. I swear I could feel that I want to rip them apart piece by piece but I was smart enough not to do it duo the fact that I could force Raven to use the Spring Maiden's powers. I decided to went to that village and try collecting loot from house to house after they left. I got medical supplies, can food, other meat that I find in the fridges and things that I could use for cooking, a large matress and pillows that I could use to sleep. I swear that sleeping in the ground is killing my back, even though I don't need to sleep.

I move alot of things which took me hours to a cave in a large mountain where I am now living for the past 2 weeks, good thing the cave isn't filled with Grimm. Placing lanterns on certain places, moving the large mattress in the corner of the cave. Putting the medical supplies next to the mattress, putting the food into a cart which I just found that out of nowhere and done.

I think I'll go get some firewood so I could feed myself, 2 weeks without of eating and finally, food! Exiting the cave and jump off as I turn my arms into wings, flying down to the forest.

I walk to the forest as I saw a few Grimm in the forest, they were stepping out of my way to may a path like I am an Alpha for no reason, that didn't botther as I collect many firewood as I can, 5 minutes have pass a I have gathered alot of firewood and small rocks. Placing the rock in a form of a circle and put the firewoord on each side.

Kneeling as I open my mouth and breath a little fire to the wood, once that done I stand up walking to the bed and lay down as I begin to prepare my plan for the future events of RWBY.

'How am I going to stop Cinder? Even If I am a Grimm, I'm still powerless against her with the Fall Maiden's power in her sleeve. I need to deal with Mercury and Emerald because those two is going to be a pain in the ass, especially Em with her illusions.'

'How the hell am I going to counter Adam's OP as fuck Semblance? I ain't going to regenerate shit from his attack even my healing factor isn't gonna help me .' I thought, thinking about the plans how I will defeat.

I might help Ozpin but I am not gonna work with that bastard, everyone in the fandom already hated the guy when every shit Jinn revealed to us was fucked up. The gods are nothing but retarded bitches. The RWBYverse is just a goddamn fucked up world, they are the reason why Salem went ape shit on humanity and Faunus'.

Before I could make another sencond thought, I sense negativity around the forest, deciding to check it out. I stand up off of my bed exiting the cave and took off. Why do I feel like the universe had other plans for me?

I spotted a white figure that was laying on the ground, said figure was surrounded by 4 Beowolves and 2 Ursa Majors and there is a dead 3 Beringels on the sides as their bodies disintegrate into dust. Getting closer to the figure, I come across a sight that I remembered in Volume 6: Our Way.

The figure was a female, she had black hair and red tips in the end. Pale skin, black blouse and a shirt with the same color as the blouse, and a white cloak. This person was Ruby's mom that was about to die and never to come back to her home forever.

This woman was... Summer Rose and she looked like she took a beating from those Grimm.

Seems that I am in the past before Volume 1 started. Diving into the ground opening my mouth as I lunged at the Beowolf that was about to finish Summer, biting hard in it's neck snapping it and throw it aways as I saw the Grimm died. The others looked at me growling.

One Ursa Major stepped foward before roaring, I kinda understand what the Grimm said though its like. "Traitor!"

I roared back. "You motherfuckers ain't gonna kill her." Welp, might as well change the timeline and make Summer alive. Ruby, Yang, Tai and Qrow might be still be happy that Summer's alive.

The biggest Ursa, From its size it seems like a Major roared, it sounded like. "Attack the traitor!" 2 of the 3 remaining Beowolfs charge at me.

I waited for a moment to strike, a Beowolf tried to bite my neck, I stretch my arm to the Beowolf's neck pinning it to a tree, the other one tried to bite my out stretch arm but I didn't let it, I stretch my other arm to it's neck in additionly pinning it onto another tree. I glared at the two, the two pinned Beowolves tried to claw at the arm that pinned them but I ignored the pain. Snapping their necks as they fall limp.

I let go of their bodies and returned my arms to their normal length, satisfied as I saw Beowolves' bodies disintegrate.

I stared at the remaining Grimm. The last Beowolf that looked like an Alpha judging by its size and armor covered in certain areas, it was backing up, the Ursa Major notice this, it glared and roared. "Where do you think your going!?"

The Alpha Beowolf howled in responsed and sounded like. "Umm, that new kin of our I never seen before made three of my group into a pile of bodies..."

So Grimm Merkavas dosen't exist here and I am the only Grimm Merkava here, I hope Salem won't spot me and decided to make copies, they are gonna be a pain in the ass.

The Major snorted. "I don't care, just attack or I'll kill you myself."

The Alpha shivered, then it look at me and charged. I feel sympathy towards it, getting ready for it's attack. It tried to pounce on me then I moved quickly and grabbed him with my over stretch arms and swung it the air, then I breath a fire ball at it, incinerating it, the Alpha made one last howl before it was turned into dust.

I look at two Ursa remaining. The other Ursa that look also like a Major roared at me before charging.

I didn't react fast enough as the Ursa Major pounce on me.

It tried to bite but my long arms keep the jaws at bay, then something pop out of my head. 'Hope this works.'

I grabbed the upper and lower jaw keeping the mouth open, charging a fire ball onto it's mouth. It back away trying to upchuck the fire ball, then it started to burn up, it roared before the Grimm exploded.

I stared at the ground where the once Ursa Major standed. 'That worked?'

I suddenly feel the ground shake "Huh? What's goi—HOLY SHIT!"

I didn't have time to register that the Major was charging at me, it rammed into me, sending me onto a tree breaking it. Getting up slowly and saw the Ursa slowly walk to Summer.

'Fuck!' I thought.

Without a second thought I stretch my arm to the side of the Major digging my claws into it. It moved it's body around sending me to the Ursa.

It grabbed me and roared onto my face, it kinda sounded like "Why are you defending this human!? We are orded to kill the Silver Eyed Warriors by Mistress!"

I hissed at the Ursa. "None of your business, idiot."

Ursa snorted and roared back. "Your disobedience will upset Mistress, but I know she willl kill you for your disobedience, I should just kill you here and now."

It raised his other paw and prepared to stab me, but until...

"Not over yet!" I yelled, headbutting the bear Grimm making it backed up, said Grimm was off guard and took this chance to kill it.

I flew off the sky as I disappeared from its sight.

One second have passed.

Two seconds have passed.

Three seconds have passed.

Four seconds have passed.

Five seconds have passed.

Six seconds have passed.

SEVEN SECONDS HAVE PASSED!

The Ursa Major looked at the sky as a big shadow block the light from the Grimm, the Grimm saw me carry a big boulder and I was gonna use it to crush the Grimm.

"BIG BOULDER DA!" I roared as I smashed the boulder to the Grimm, the Ursa tried to use it's best to escape but its futile.

"It's pointless! You cannot escape!" I screamed the top of my lungs, I then started smashing the the boulder to push it to crush the Ursa Major while yelling a certain vampire's war cry.

"MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA! MUDA!"

"Eight seconds have passed!" Cocking my fist as a gave out another war cry, "WRYYYYYYYYYYYY!"

"FLAT AS A PANCAKE!" I screeched as I slammed my fist into the boulder, the boulder made a huge crack. The Ursa Major gave one last roar befire getting crushed, it created a shockwave. I just love doing that shit though.

"Nine seconds have passed." I stated as I stared the crushed Ursa Major. Jumping off the boulder I saw Summer regain conscious but she was still lying on the ground with wide eyes, maybe she saw me that I kill those Grimm.

"Wh-what are y-you." She whispered before going unconscious again. Deciding that I should help her, I pick her and then head back to the mountains as I stabbed another Beowolf that failed to lunged at me in it's chest.

Summer Rose woke up with a fright, breathing heavily. She was wondering why she was in a bed, maybe someone spot her and decided to save her from that Grimm she never seen before had white hair from its back which it attacked its own kin without hesitation and second, that Grimm talked! That Grimm literally can stretch its arms and breath fire, what most shocked her that she saw the humanoid Grimm fly and then returned with a huge boulder it uses it to crush the Ursa Major! Ooooh, that fight would be awesome!

'Urgh! Focus, Summer, focus! I need to get out of here and go back to Vale, then I can inform Ozpin of, well, everything, and take a rest from huntress work. I wasn't planning to so soon, but after this, I think I've earned it.'

'Okay, okay. Let's see what we can work with: I don't know where am I and I am sure I am far away from Vale.' Memories of after the fight yesterday were a bit blurry. Probably due to the loss of blood.

'I think someone must treated my wounds duo that I feel bandages wraped around my body.'

Checking her surroundings that she is in a cave, there were lanterns on certain places, medical suplies on her left, a cart filled with can food and other food wraped in plastic.

"Yo, so you're awake." A familiar double toned voice spoke, turning around she saw the same Grimm that killed off its own kin.

Summer tensed up as the humanoid Grimm approached her, she saw its arm moved and it was holding a plate with food on it. The unknown Grimm puts the plate on her lap.

"Eat up, and stop thinking that I am going to kill you" It said soothingly.

"W-what?"

The Grimm sighed before opening its mouth. "I said I won't kill you, it should be apparent that I am different from the others. I am not even working with Salem, you saw how I killed those Grimm which proves that I don't work for her. Hell, those guys even called me a traitor."

Those Grimm called him a traitor? Well, that's a new one.

"So, may I know your name? Mines Merkava or Sam call me whatever you want." The Grimm said, she swore that it was smiling at her

The Silver Eyed woman was hesitant, she was still suspicious about this Grimm who saved her life whenever this Grimm was a spy for Salem, returning the smile, but she wasn't afraid anymore.

"Summer, Summer Rose and nice to meet you Sam."

Well that's done.

So this is going to be my second SI fic, go to my profile and check my other SI story.

Leave a review and what are your thoughts on this story!

What is going to be Summer's weapon and the name of said weapon?

Thank you Matt for making the fight scene, I really like it though

Chapter Edited: 1/19/2020