Disclaimer: I don't own Undertale, Toby Fox does. I also don't own any AUs they may be used in this story and they belong to their own creators. I do own the OC's.

The merging felt like it took years to complete but I have never felt more whole in my entire existence. I'm not complete by any means but if I can absorb just a few more pieces, I can break these chains and escape. My luck must be astounding because as soon as I looked, another string was taunt. However, the Gaster on the other end isn't afraid but curious. I hide myself in the shadows again, never know what could be at the end of the line. I chuckle at my pun before gently tugging the string. With a pop another Gaster appears. Let's just say I went blind for a second with how brightly colored he was. Orange sweater under a bright blue vest, a giant green button saying '#1 dad' and black slacks. The orange and blue halos that are his eyes are looking around with curiosity.

"Hello?" He calls. I can tell right away that he must be super optimistic, happy and excited all the time. He has that innocent and naive aura around him. I'll have to choose my words carefully around this one.

"Who are you?" I ask, my voice slightly less scratchy but still just as deep.

"Oh! I'm W.D. Gaster! Nice to meet you!" He says cheerfully with a big bright blinding smile. I have to blink a few times. He does not belong here, in the Void, that much is clear. That or he hasn't been hear long enough for that happiness to fade.

I reveal myself, again, he is only the size of my hand. He continues to smile up at me. "Do you know why you are here?" I ask him as I begin to pace around him.

He tilts his head in a way that could be called cute, "No. Why am I here?"

Oh my god. This is going to be hard. I gently tug the string as three green soul pieces pop from his chest. Kindness. Of course. Somehow I expected that to be his main trait. That or patience. "Let me tell you a story. There once was a Doctor who served under the royal family. He created many things and earned many awards. However, monsters in the underground were getting desperate to escape. The King was feeling the peer pressure and had asked the Doctor to create something that would help bring power to the Underground. It took many years but eventually he created his best achievement yet and named it the Core." His smile had gradually lessened and was now a frown.

He knew this, he had lived it. "However, this was not enough. The King wanted everyone to be free and so asked the Doctor to create weapons to help destroy the barrier and defeat the humans, by any means necessary." I lean down to whisper the last part in his ear before continuing my pacing.

"The Doctor was, many would say, a strange fellow. He was quiet, analytical and observed everything his eyes could find. His mind worked faster than the speed of light with complex equations and various theories every minute. A genius in his own right. Many did not know that the Doctor was actually a General in the war, having participated when his entire village was attack and killed. He, along side the Fire General, had slayed millions. This kind of dedication, these experiences and the thought that even with all they had, it wasn't enough, this would leave any impression on anyone and not a good one. He hid it well, the memories that visit him in his dreams, the illusions his eyes relayed to him during the day, the flashbacks that are triggered by the most ordinary of things. All of this and the pressure of his work under the King, well, lets just say that the King had said the magic words. Any means necessary, indeed." I chuckle at his face, full of horror and guilt. "The King had given him permission to let loose, had given him permission and the freedom to do whatever he wanted. So, he did things that even insane people wouldn't do. His tortured himself, experimented on various monsters and on himself. He even cut the bone from his palms in order to gain DNA material for creating the perfect weapons."

I could see him hide his hands behind him, rubbing at the circles. "Now, this is where it gets good. The weapons, known as Sans-001 and Papyrus-002, had grown and honestly the experiment was a success. One had superiority in magic and the other excelled on the physical side of things. That is until they gain a conscious of their own."

"I... remember this all vaguely. Like I went through it twice, once in my life and once in a past life..." He mutters out. "As soon as they gained their own personalities, I released them. They became my sons and I retired from the scientist career. We all moved to Snowdin until the Core began to act up. Seeing as I was the creator, I was called to fix the problem. But... Something happened and after it was all said and done, I found myself here."

I chuckle. "That is where the story diverges from the path. You see while you showed them mercy, the Doctor did not. He kept them there in the labs. He conducted experiments on them but he did gradually become a father figure when he found they had minds of their own. However, his labs were located in the Core. So, when the Core began to meltdown, he was already there with Sans and Papyrus. Papyrus was too young to remember any of this but Sans... He was the one who pushed the Doctor into the Core. It was an accident. His magic had been acting up all week and it just so happened that a burst had escaped him when he was reaching for the Doctor on the edge of the Core." Horror filled his eyes. "He still remembers, by the way. His magic had blocked the explosion of particles. The Doctor was torn to pieces and scattered across the multiverse, everyone forgetting all about him except for Sans."

I lean down so that we were face to face, "You must be wondering why I'm telling you this and what it has to do with you. You see while the Doctor was being sent across the multiverse, pieces of him found themselves in the Void. This place is where nothing and everything exists. Some pieces kept the original Doctors personality and features and found themselves here. Others were sent to various other realities, such as where its kill or be killed or... where you lived." I turn and continue my circling.

"Now let me tell you another story. Once there was a human boy. This boy was special. He was born on a night with a blood moon, which is told to give brith to the darkest of souls and demons. This just so happened to be slightly correct. The boy was born with demon abilities, yes, but they were locked until the day he awoken such powers when he really needed them. So as the years went by he become a prodigy. However, with his intelligence, he watched as his parents grew fearful of him and began to change, believing they birthed a demon. From the time he turned 4 to the time he turn 18, they had beaten him, broken each of his bones at least once, scarred him, raped him, treated him like a slave and more. The only reason he put up with it was because it was either him or his little sister." He gasps in horror and covered his mouth with his holed palms. "During the years, he has died multiple times but due to his demonic nature, he always found himself in the void. This is where he meets the Doctor and they become fast friends. In fact, the Doctor becomes the father the boy never had. When he reached the age of 18, the legal adult age, he tried to take his sister and leave. His parents were furious. His father went to find his gun, which the boy had hidden all the ammo of said gun, and his mother stabs him in his chest just missing his heart. He tells his sister to run and get help and she does. You see, the Doctor had taught the boy various types of magic and due to his demonic side, fire magic was easily his favorite. So, he sets the house on fire along with his parents. Better to burn the evidence and all memories of this place. However, as he walked from room to room, he grew weak and the boy knew his time was up. So, he makes a deal with the Doctor. The Doctor was old and wished to be free of the Void, so, he offered to merge his soul with the boys. This would effectively kill him yet keep him alive. Basically the boy would become the dominant and essentially become the next Gaster. However, in doing so, the curse of being stuck in the Void would also transfer to the boy. So, with his last breath he accepts the deal and the last thing he hears is his sister calling his name."

"The...the boy...he was you...wasn't he?" The Gaster in front of me whispers in sorrow and shock. His eyes wide and sad and his smile a concerned frown.

I lean down again and pull down my hood, "Yes. You see, my sister is Frisk. I was able to follow her adventures through the Underground and watch because of the bond we share. However, this timeline is purely pacifist and the demon Chara was destroying this world by making my sister genocidal. I needed to stop this and I did. The monsters are now free and everyone is alive and happy. But the Void has chained me here. I was promised release but instead I was betrayed. This is where you come in."

"Me? What do I have to do with this?" He was incredulous and for good reasons.

"Before you, I was trapped with only little bits of my power available because these accursed chains block my natural magic output. This is why I am so big, magical backup. I was able to create these strings and sent them out into the Void to search for something that would help. They found a Gaster from another universe, where its kill or be killed. I then gained a theory. If Gaster was shattered, can I be free from the Void if I gain more of my soul back, seeing as he is now me? I offered him release and two wishes in return for his soul pieces, he accepted. My theory worked. I feel much more whole and the chains became more brittle but still too strong to break and escape. I need only a few more pieces to escape." I can see realization crawl across his face. "I'm willing to offer you the same. When we merge you will feel more whole and be free. It will be like death but you are still alive within me, experiencing what I experience as if we were never two separate beings."

He thinks it over before asking, "What did the Gaster before me ask for?"

"He asked for me to bring his universes Sans and Papyrus to a safer one and for me to watch over them. His second wish was to know my true name. I granted his first wish by using the bonds he had to teleport them through the Void and out to my universe. As I said before, this timeline no longer suffers resets and is completely pacifist, thus completely safe. However, I had to compromise on the watching over them part. I am stuck here, chained against my will and so I can't watch over them. So, I offered to guide them to my Sans and Papyrus until I can escape. With you, I'll finally be able to complete the deal. So do you accept?" I ask him.

He thinks some more before nodding. "I want the same. I wish for my Sans and Papyrus to be brought here and for you to watch over them as well. However, my second wish is for you to complete our soul once and for all."

I nod. "It shall be done." I grab his soul pieces and the absorption process begins again. Again, it feels like years before its done but when it is, the chains around my limbs snap and crumble to dust. The Void rumbles like an earthquake. Furious at my freedom and so, I hurriedly make a portal to where Sans and Papyrus are now living. I quickly close it behind me before falling to my knees in pain.

"Raziel?!"

"Gaster?!"

"What the hell?!"

Authors Note: Another cookie for those who can guess which universe this Gaster is from. :D