"My reason being here is very simple, I want to make a deal with you" Since Thranduil is so straightforward. Gray said his purpose directly.
"And what deal could you offer?" Thranduil said with a smile on his face.
"I can bring you what you desire..." Gray said to here and stopped while looking at Thranduil wanting to see if his word effects him.
And as he expected Thranduil's eyebrow raised a little which shows that Gray's word was effective and moved his thoughts.
"White gems, of pure starlight" The moment Gray said those words, the smile on Thranduil's face disappeared.
"Everyone gets out, leave us alone" Thranduil said to the elves around. He doesn't want the others to hear their conversation.
When everyone left Thranduil calmed down his emotions, and looked at Gray.
"What do you want?" Thranduil didn't ask why Gray know what he wants nor how he knows the White gems, Those gems in his mind is the only thing left after his wife died, so anything related to it he will treat it with care, even if its just words.
Besides, he already met Thorin before seeing Gray. And he already knows they are going to the mountain, there may really be a chance to get the gems back!.
Seeing him like this, Gray smiled, he knows the first step was a success.
"I want you to help me killing the dragon!!!" Gray said.
"What? Do you really think I will do what you said?" Thranduil heard Gray's words and was somehow disappointed if he's sure to kill the dragon from the beginning, why will he wait till now?.
"Of course not, my king, It's not that kind of help. To kill the dragon is my duty" Gray said.
"What I need is your corporation to help me remove the curse that was placed on me" Gray finally showed his foxtail and said.
"Curse?" Thranduil couldn't understand Gray's meaning.
Gray didn't speak and removed the hair on his left eye, revealing his silver eye.
When Thranduil saw Gray's eye color, he felt very weird, Gray's left eye gave him weird feeling, it's similar to Elves silver eyes but much colder.
"Mr. Gray I still don't understand, how can I help you with your curse? And what does it have with killing the dragon?" Thranduil didn't know that Gray's weird eyes color was because of the Crown, and though it's the curse that Gray talking about.
"Of course removing it will help me, because of this curse I can't use my full power, only by removing it I will have enough strength to kill the dragon" Gray mixed the truth with lies, if he copied Thranduil genes, Gray really will get stronger, and by using the curse he will explain how he became become elf after copy the genes.
"As for how you can help me, It's very simple your hight elven bloodline can purify my curse, you simply need to let me hold your hand, and I'll be able to purify my curse" Gray doesn't expect Thranduil to belive his lies completely, but as long as he gave him a reason to agree, that's enough.
As Gray expected, Thranduil didn't believe what he said, he knows Gray has another purpose. But at the same time he doesn't think Gray will hurt him in any chance if Gray really wants to do something he will be able to counter him fast. After all the eleven king skills is not a joke.
"Very well, I'll help you, I hope you don't disappoint me" After thinking about this deal, Thranduil found that he's not losing anything anyway. besides Gray already shows some of his power, maybe if he really gets stronger, he will have a chance to kill Smaug(the dragon) and he will get his wife only legacy back. Thinking of his dead wife, Thranduil didn't hesitate more and walked to Gray's side.
He raised his hand to Gray and said; "Now show me how can you remove your curse".
Gray looked at Thranduil's hand blankly; "So easy?" Gray didn't expect Thranduil to agree fast like this.
Gray didn't know how much Thranduil desire for those gems. Thranduil even sacrificed many elves in the war because of his desire for the gems. Let's not say simply shaking hands.
Even though Gray felt weird, he was more excited!. Elven gene, the most important thing he desired for in this world!. Long life span!, larger C Disk!, and most importantly he won't be killed by the crown on his head.
Gray raised his hand and caught Thranduil's hand.
[Ding!!: found a removable storage device.]
Seeing his ability activated Gray was more excited.
Directly he entered Thranduil's C disk.
Searching inside, soon he saw what he wanted to see [High Elves Bloodline].
Looking at it, Gray was so happy, he was worried since the elves are a different race than humans, he wouldn't be able to copy his genes smoothly. But now apparently he was worried for nothing.
Gray looked at the gene size, but when he saw it, his face becomes weird.
"34GB! What the hell!" Gray was surprised when he saw the gene size, all he had 35GB, if he had copied anything else before, he wouldn't be able to copy anything right now. Gray felt lucky that he thought about this probability before and didn't copy anything else.
Gray didn't copy the gene directly but went back to the D disk. Since he has a chance to copy, he will copy all that he needs.
When he entered Thranduil's D disk, he found so many skills, Thranduil lived for too long, so he naturally learned many things.
Soon Gray saw what he wanted, [Sword skills], [Elves Combat Arts], [Archer's eye], etc.
Gray saw many skills but didn't copy all of them, only [Sword skills] and [Elves Combat Arts]. Gray saw many skills inside Thranduil's disk even some magical skills. But he doesn't understand the magic in this world, nor he thinks the other skills will be useful for him later. That's why he didn't try to copy Gandalf's skill before.
The skills Gray wanted to copy wasn't so large each about 2GB, Gray copied them fast, because of his strength raised more the before. the progress was fast.
After coping with the skills Gray felt like he has learned many skills, not just normal learning but more like he trained these skills for many years.
Feeling the change in his mind and body, Gray didn't stop and started to copy the elven bloodline.
Thranduil wanted to see how Gray will remove the curse so he watched Gray carefully, and notice that Gray's gesture suddenly changed as if a great elven warrior standing in front of him. This made him believe Gray words some more.
34GB is very large for Gray but it wasn't slow to copy either. because of his strength rising 15m minutes later the progress ended. which means the copy ended.
one second.....
two second .....
"Nothing?" Gray withdraw his hand and tried to feel his body. But nothing happened.
Suddenly Gray stiffened, the skin on his body started to crack from top to bottom. Before he could react the blood flow from every crack on his body.
"ARGHH" for a second, Gray felt as if he will die from pain, but this pain came fast and went fast.
Soon he felt very comfortable all over his body as if he got to rest after many years of work.
Gray closed his eyes enjoying this feeling.
Gray didn't realize how shocking this scan for Thranduil. When Gray started to bleed Thranduil was a little worried and even though that Gray may die. After all, Gray bled a lot, almost all the blood on his body went out.
But suddenly a very huge vitality appeared from his body and a green light appeared around him, repairing his wounds. Even Gray's original look started to change!.
Gray's originally mature face started getting younger, his hair slowly turning from half silver half black to completely silver. and his body also become taller and thinner. And his skin becomes whiter and paler. Not sick white, but elegant and beautiful.
At this time the crown on his head as if sensed the change on Gray's body, started to shine a black-light absorbing all the green light around. But as if it was satisfied, it stopped shining and also started to evolve.
With the evolution of the Crown, the second transformation of Gray started but this time only his hair lost his color and turned to pure snow white.
Half an hour later, the green light around Gray started to disappear slowly.
When all the light disappears, Gray's face reappeared.
His eyes slowly opened. Two silver eyes appeared in the world.
...
(Author: hmmm, I'm really not good at describing ¯\_(ツ)_/¯)