SPOILER ALERT FOR LAST GUARDIAN!!! this starts at the end of The Last Guardian, when Opal is dying.
As the cold blade pierced her heart, Opal looked up at Artemis with more hatred than everything she ever hated combined.
She said “You know, I used to imagine a human with magic, he had the power to dampen everyone’s intelligence around him, I couldn’t visualize it-” Opal said
“-Nonononono not this again” It was your voice” opal said
“No, you’re lying” Artemis said
“You were a clone made by the greatest minds in the fairy population, trying to make the worlds biggest idiot, they made you to make my predecessors not commit crimes, you’ve been living longer than most fairy’s do, they have just been mind wiping your lives away and shrinking you back down. You don’t have a soul, you monster.” Opal wheezed and died.
Artemis then knew what do.
6 months later
When Artemis woke up he knew the only reason he was there was because of Holly’s soul, her eye was what saved him. He looked deep into Holly’s eyes, and saw the same exact expression she had when she saw Nopal, he was had probably said something, and he was looking for confirmation.
A clone, he didn’t have a soul. Opal’s last words would haunt him forever ‘You don’t have a soul. You monster.’