When he checked out the hude golem, it said that it was an empty golem body and if he gave it enough energy it will become his summon but Sin-ui saw that there was a warning if you didn't have enough mana to fill it.
The warning just said you would die and there was no way to disconnect yourself from the energy transfer after it already started so if you don't have enough energy then you would just simply die.
But thanks to his appraisal ability, he was able to fully see how much energy he needed to give but if the core was fully empty then Sin-ui wouldn't have been able to fill it's core to make it his summon.
Since right now the core has already been filled nearly halfway so Sin-ui right now has barely enough energy to make it into his summon even though he just got a big increase in his mental energy so he was pretty lucky.
So Sin-ui then started transfering nearly all of his energies into the golem's core and as he did it started to shine different colors each time he changed the energy he was transfering into the golem's core.
Although he had enough the energy transfer was really slow so Sin-ui had to use his mental energy for last since he needed to have enough focus to transfer each and every energy carefully and efficiently.
If he didn't do that then it would be just as simple as not having enough energy for the core and he would just die as well so he needed to be extremely focused and he didn't have time to focus on anything else.
Sin-ui stayed in the same position and continuously transfered energy into the golem's core for over three and a half hours straight all the while he nearly used up all of his energies and he wasn't even done yet.
He still needed to give a bit more energy but now he was spending his mental energy since all of his other energies are now recovering and he isn't able to use them anymore or he might pass out of overuse of them.
While he was transferring his mental energy, his sight started to fade a bit and his eyes were getting heavier and heavier as he transferred his mental energy, the golem's core had a huge space for energy.
After a bit Sin-ui just needed to finish up transferring the mana and he really hoped that the golem would be a good asset because he risked his life to get it but as he was about to complete it, his eyes were slowly closing.
Then when he noticed this he tried to open his eyes but they weren't reaponding and now he was definitely going to die if he didn't do anything so now he was panicking trying to think of what to do since he was going to go unconscious.
Which during this time he suddenly remembered about his universal energy but he still wasn't sure if it would work like normal energy but he tried it anyway since he was going to die anyway if he didn't even try using it.
But then suddenly as he transferred just a single drop of his abundant universal energy the core was overflowing with energy, there was too much energy for it to handle so it started increasing the size of it's core.
The core then started to glow even brighter even though it's outer appearance didn't change, on the inside it grew immensely so that it could be able to contain, Sin-ui's universal energy so he was extremely surprised.
When he was surprised his eyes then started closed fully as he suddenly heard a notification noise from the system but he already was unconscious as the system notification appeared so he wasn't able to see it.
In just a second for Sin-ui, he started opening his eyes to find a huge golem that had a purple ooze color and had what look like stars in him just starring at him without doing anything so he was surprised.
So then he suddenly activated his flight ability and flew up into the air far out of it's reach but then suddenly it's core started to glow a purple color and it's size grew tremendously and it was now able to reach Sin-ui.
Except it wasn't attacking Sin-ui so he tried to remember what happened before he woke up and then he finally remembered that he was filling a golem's core with his energy and then realized that the golem was gone.
Since he noticed this, he started appraising the golem that was trying to follow him and realized that the golem was his summon so he told it to shrink into his size and after saying that it immediately listened to him.
Sin-ui was extremely curious as to why it looked like outer space but when he checked it's species name, it was called "Universal Golem" and he was a bit suspicious of it's name and he realized something.
He remembered about the system notification that he heard before he passed out so then he started checking his notifications and the once he found the notification he then opened the notification to check if it was true.
[Ding! Sin-ui's Golem has evolved to the mythical species, "Universal Golem" with the help of the Supreme Being Class! The Golem can be named and is now fully a part of the Supreme Being Class!]
After checking the notification he chuckled a bit then checked to see if he got any new abilities and he did and the ability he got was called "Universal Golem", he was able to fully change the golem into whatever he wanted.
Then he decided to change it's appearance to look like him and once he did that he then started started to use the other powers of the ability, he was able to recall and summon the golem unlike the other summons he had.
There was even a special feature where he could make the golem turn into his armour and when he checked the stats of the golem, it was incredibly overpowered and it was definitely stronger than him now.
But thanks to him giving his energy, it was now completely loyal to Sin-ui and it would listen to all of his orders and commands without any hesitation and so risking his life was definitely worth it.
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Author: 『Hey Guys, Author here, I just wanted to thank you all for reading this chapter and helping this series grow and I really hope that you enjoyed and if you did please add it to your library it would help out a ton! But again thanks for reading and this series first season is about to end so after chapter 50, you might need to wait a while but it will definitely come back! Hope you enjoyed! ♥️』