Some kind of fantasy fairy tale thing with a handful of Ghost Story and a lesson about preserving languages.

There was this young man, I'm pretty sure he was a prince, but he was also a ghost. He was trying to save his family and his language, both of which were dying out. While he was still alive he'd managed to teach it to some surviving members, but they were failing in their efforts to pass the language on. The ghosts of his family also needed saving from some sort of afterlife demon. He had blond hair, blue armor and some sort of magic, but every time he used his magic a bit of his ghost disappeared (like Harry in ghost story) and whichever words he cast the spell with disappeared from his memory. He had to go all over the world to find out who could speak any languages similar to his. He found one on a remote mountain (of who could basically understand him, and asked him how he could get to the underworld. The man told him of a cave at the bottom of the mountain that could lead him there, but he had to be especially careful as a ghost. The world of the afterlife was more dangerous to those who are dead and didn't make it there than even to living mortals who tried to venture there.
Down in the cave, our hero faced a few monsters. He took care of them with his magic, without realizing that by doing so he was making his eventual goal even more difficult. The cave sloped downward, and got darker and darker. At the bottom were some human-looking guards, but they were asleep. There didn't seem to be anything they were guarding, just a dead end. Our hero (ok, enough, I'm naming him Chad) could hear something on the other side of the cave's wall. Being a ghost, he just slid through the wall and was almost blinded by light. He was standing on this floating platform in a blank space. The sky had a sun in it, so he called it the sky, but it was everywhere. There was nothing beneath him, other than the sun nothing above him. The sky was light pink. The sun reflected on the platform, which was made of glass. After his eyes adjusted, he saw the platform stretch ahead of him. Every few feet was a fire, burning nothing, just there. And a bit of a distance away was an archway. The platform looked the same beyond it, he couldn't determine what it was for. The arch was made of etched glass, pieces of it glowed with the same orange color as the fires scattered around. After taking all this in, Chad moved forward.
He inspected one of the fires. It wasn't fire. It was similar, it moved like fire. It was gaseous, and it didn't burn. Chad decided that as a ghost he was invincible to most elements, so he stuck his hand in it. When he did, he heard screams, screams of people speaking his language. He pulled his hand out quickly, the screams were so horrible and heartbreaking. He noticed he'd gained some solidity that he'd lost from using his magic, but his hand bore several glowing scars in the shapes of letters. He didn't recognize them.
Chad went through the archway. Something appeared above him. It was a map of the world, sort of. A different world of course, none of the continents were ours. He could see the continents, but they were flipped upside down. It was like he was viewing the map from below it. As he watched, one of them dissolved. The one he'd lived on. He heard a laugh and turned to face the edge of the platform. A witch was standing there. His family was behind her, bound by silver chains, the only cool color in this entire landscape.
The witch laughed at him again. She told him that no one in the living world spoke his language anymore. It only existed in the memories of the ghosts she had captured, those of his family. And she'd trap Chad here too. Chad tried to cast magic at her, but when he tried to speak his hand burned horribly. He was somehow cursed by that fire. He looked at the letters on his hand, still not recognizing which ones they were, but he found a word that did not contain any of those shapes. He used it to cast a spell at the witch. He heard his father scream something like "Chad, no!" Chad fell on his knees. His ghost was fading faster now. He looked at his family, they grew blurrier. He couldn't understand what they were saying to him. He couldn't speak his language anymore. I could feel his regret and dispair. Then I woke up.