Before they collapsed, Caster extracted the grail from Gorgon securing it.
Caster's presence began to fade, he murmured "Finally" 
The main rule of the contract between the Grail and Cael is him being a summon for it, which he succeeded. Just as backup, he gave King Gilgamesh the watch, so they will have time to plan and repair this singularity as a part of protecting it. 
It doesn't matter if he has it or not if the grail had survived or not. He either has to wait till the singularity is repaired or destroyed. Either way, He has done his part. 
****Cosmos of Eternal Stasis****
Cael P.O.V
I stood before my grail, as my caster self completed the contract and ceased to exist. 
The Holy Grail glowed and the string of words entered my mind
"Contract complete" 
It vanished from existence as I stood in front of a wide glowing path in my mind. 
"This...is my path" 
I saw it growing from 'me' and reaching the boundary of the root. 
I could see the beginning and the end but it is not it. 
I finally understood the 'key' to the lock. 
"It is my origin, Logic"
The path converged as the beginning and the end merged into one, into me. 
I finally achieved it. 
True Magic: 'Truth Manifestation'
Domain: Logic. 
My True Magic allows me to create Logic and implement it. Whatever I craft is the truth, It is the new Logic. 
I don't even have to 'think' per se, I just have to will it and My desires shall happen without me 'thinking' about 'hows' and 'whys'. As long as I feel like it. A new logic I dictated can be actualized. Hell, I can even create a custom logic if I want to. 
It surpasses all Magecraft and even my Arcane Magic. 
Because My True Magic is not limited to Dimensions. My Logic will prevail in the face of higher dimensional logic too. 
No paradox can stop my Magic, nor are they any Consequences. 
I understand why, my magecraft spells could open portals, and control a higher level of logic after I gained the 'path to root'. It's all a small portion of my actual magic allowing me to create small miracles. 
My reality Marble shattered as I stood in space, looking down on Earth, feeling the new power. The things I can do.No, There is no 'can' or 'cannot' anymore. There are no 'rules' for me anymore.
I may not be the strongest, as there is always something bigger but that was never my goal. With my magic, I can deal with everything as I set my logic as such.
First and foremost, I got rid of the Halo of resurrection. 
"Now then, Time to erase my presence from this world" 
I used True Magic to erase my presence, to no longer exist in this world, erasing me from the history of the world, yet I exist. 
Then, I went to the Kaleidoscope magician because he's the one person who has the record of mine. 
As he's outside of Space-time, I paved the way to the very beginning of things. When he will first notice my presence.
As he's reading about the anomaly of the technology which I released, when I was young. He exclaimed 
"How is this even p-"
I knocked him out, making him 'unexist' for a while.
Due to my unique reincarnation, I only exist in one timeline. I snapped my fingers erasing 'my' presence from the Grimoire. 
The Grimoire is just a conduit of true magic. So, It is easy to manipulate it. 
Feeling a Gaze, I turned to see my past self seeing me with the 'Eye of Enlightenment' but he can't see me because I am 'erased' from the world itself. I no longer exist.
I left the space manipulating Zelretch's memory making him feel like he was mistaken. 
Seeing my past self from here, Finally, everything clicked.
"Hahahahahahaha! So, I was protecting myself this whole time!!"
I laughed like a madman, free from the stress of everything, thinking about the crazy scenario. 
I've always been scared about the counter force and the true magicians who are the main strongest beings in reality. I have always been apprehensive about Eternity God protecting me for unknown reasons even if he says, he respects me for my drive for magic.
But now that I realized the truth, I've never been this free. 
I looked into the past, where the Seventh singularity is currently happening. 
Since I'm erased from existence itself and it is a singularity. The events changed, everything happened like it did in Grand Order. 
I didn't feel like my effort went to waste. I could change the event where I intervened but I don't care. That's why, the events reverted to the original Grand order. 
I erased every connection I had like the spirit contracts and fate, everything in this world except for two people. 
Gaining my Independence. 
My Goal in this world is complete. 
I left the Nasuverse.
******Earth-Milky Way galaxy-2040*****
I went back to my first world.
This world is extremely weak, I can destroy this with my Magecraft Alone.
I rewrite the reality so, no nuclear war happened and it will never happen. 
On my Private Island, I created a Good looking Natural themed mansion with everything in it. 
I summoned them, My Wife stood with our child in her arms.
"Cael" 
Hearing Zidikle call me after a long time, the love behind it. 
I felt something inexplicable within my heart. 
I did something I haven't done in my both lifetimes. 
I shed tears hugging her and my child. 
"I missed you, so much. I know You will make it and come back for me!! Look, Sweety, this is your dada!" 
"Dada?" I heard my Child call me.
My heart felt so happy, the joy of seeing my child for the first time, the joy of hearing my child for the first time, the joy of holding her. 
"I love you both" 
I filled my wife and child with kisses and hugs. 
They are all that matters to me from now on. 
I may research magic in the future to pass the time.  With my magic, Omnipotence is just a matter of thought after all.
Until then, I showed them the world, spending all my time with my wife and child, going on adventures together. 
The world never looked so beautiful. 
#############THE END############
THANK YOU FOR READING THIS. 
I HOPE YOU ALL ENJOYED THIS BOOK.