Jacob was looking through the window of the train, during his travel to Crystal Empire. I wasn't looking at something interesting. He was just thinking about anything, but his insanity attack. At first, he thought about his first meeting with Ven'galion, face to face. It was on his wedding with Kay'llana. When everything was perfect, he attacked. While that, Kay'llana's father died, protecting his daugther. Jacob always wanted to forget about this day, but he couldn't, because it was also his birthday. His wedding with woman, who he loved, supposed to be the best birthday present, what he could get, but now, it's the worst day of his life. This day, the whole nightmare, called 'his life', begun.

In front of him was Celestia, Princess of Sun and ruler of Equestria. She knew, that Jacob had awful past, but she didn't care about that. She saw in him honorable and kind man, not murderer, mutant or psychopath. Princess thought, that he can forget about past and concentrate on present and future, by normal activities. Maybe she saw him as the legendary Elemental Prince, but she wasn't paying attention on that side of Jacob. Mostly, because he wasn't an alicorn.
After a few minutes, Celestia decided to break the silence.

"Are you feeling well?" She asked worried. Jacob stopped looking through the window and pointed his eyes on snow-white mare.

"Yes, I'm fine. Just some flashbacks. Don't worry about it." He said without any feelings in his voice.

"You look upset. Is there anything, you want to talk about?"

"It's not important. Remind me, why are you going to Crystal Empire?" He changed the topic.

"You know that Twilight visits there her brother and sister-in-law."

"That'll be Shining Armor and Princess Cadence."

"Well, Twilight wrote me, that something's wrong with Crystal Heart. She said, that it's corrupted by the black ice and causes strong blizzards in Empire. Twilight read every book in the Empire's library, but she didn't found anything."

"Maybe she wasn't looking for the good book." Jacob said, while summoning a book in black leather with Dark Seal on it.
"This is Gabriel's Grimoire. Inside is every known spell of the dark magic and its users. This copy belong to Ven'galion. He found it, when he was young and started to study it. You know the rest."

"You think, this is cause dark magic?"

"I don't thing, I know it. And I even know, what sorcerer did it."

Jacob started to leaf through the book and stopped on unicorn stallion with grey coat and blind eyes. His cutie mark was a snowflake, in half black and white.

"This is Blizzard Breath. He was a dark mage, older than Equestria. He's specialty was causing powerful ice storms, using dark magic. He also created Windigos, to get more anger for his blizzards. You see, dark magic's fuel are negative emotions, like jealousy, fear or anger. That's why your sister turned into Nightmare Moon and Sombra was a tyrant. When he died, he left a part of himself on the far north of Equestria. That's why it's cold there. Crystal Heart, full of love and kindness, protects Empire from the Blizzard Breath's dark magic. Looks like Gabriel resurrected him to destroy me."

"Why him, not King Sombra?" Celestia asked confused.

"Sombra is the weakest dark mage in the whole multiverse. Fear is the worst fuel for dark magic."

"What is the best, if I can ask?"

"Anger." Jacob replied. "That's why Blizzard Breath. But I'm specialist of elemental magic, so I can cure Crystal Heart. I hope so."

"Then, I'm glad, you're with me, then." Celestia said with smile. "But, what about this dark mage?"

"I know, from experience, that you can't kill something, what's already dead. We'll have to absorb his dark magic and close it in some kind of a container able to keep magic in charge. The best will be something made of silver, like casket. Perhaps Cadence has something like this..."

Then, suddenly, train instantly stopped. Jacob and Celestia fell on the floor. Inside went the stallion from the grimoire, Blizzard Breath. With every step, he made, floor and walls were covered by hoarfrost and ice. He looked at Jacob.

"The age of ice has begun." The undead said, with voice like crackling snow.

Jacob threw in him a fireball, but, before it get to him, it turned into an icicle and dropped on the floor, crashing.

"Parthetic. And you're the Gaya's Champion?"

"I'm only warming-up." BA-DUM-TSSS

Jacob created a katana and enchanted it with fire. Celestia walked next to him, preparing a spell. Human attacked stallion, but he sliped on the ice and fell on the floor. Blizzard pinned him to it with icecles. Celestia shoot the magic beam, but sorcerer dodged and turned her into an ice statue. Jacob melted the ice and made himself free. After that, he shoot from his hands a hail of metal sharps. It was that dense, that sorcerer couldn't escape from it and they teared him into little pieces. When only shreds left from the dark mage, Jacob crushed the ice shell, what covered Celestia. Mare was breathing heavily and .

"Are you okay?" Jacob asked.

"Y-yes, I'm-m-m f-f-fine." She said, shaking from a cold. Jacob took of his coat and put it on Celestia's back. She already felt better.

"Thanks for buying me some time." Jacob said, with smile.

"Is he dead dead?" She asked, looking at the stain of dried blood and grey shreds.

"No, it was only a half-measure. He'll come back soon." Jacob said, with serious tone. "We have to get to the Empire, ASAP."

Jacob jumped out of the train. Celestia sat on the ground and covered herself with Jacob's coat even more. It gave her the feeling of the hot, spring morning. Scales seemed to generate that heat, protecting Celestia from outside cold.

"GOD FUCKING DAMMIT!" Jacob screamed in rage. After that, he entered to train again. "Conductor's dead and train is freezed to the tracks. So, we're stuck here, in the middle of this snow desert."

"We can teleport there." Celestia said.

Jacob facepalmed, cause of his stupidity.

"Jacob, you fucking idiot." He said, angry on himself. "I don't think well, when it's cold."

"Do you want me to give you back your coat?"

"No, keep it." He said, protectively. "We should go."

Meanwhile, in Crystal Empire, Princess Cadence was protecting the city with her magic, from dark ice storm. Her husband, Shining Armor, was preparing guards for possible attack. Twilight was in the library, with her friends, who were helping her find some informations about Crystal Heart or dark ice.

"No. Nothing. Grr." Twilight moaned, looking for the correct book. "Why ancient libraries don't have informations about ancient magic?!" She cried out, throwing away one of the books. That book hit Spike. "Oh, sorry, Spike." She said, with nervous smile.

"Do not worry, Twilight, we'll keep lookin' for somethin' useful." Applejack said, putting one of her hooves on Twilight's shoulder.

"Thanks, Applejack. Maybe Jacob would know something about this? He fought with dark magic longer, than us." Twilight infered, scratching back of her head, making nerd face. "But for now, keep looking."

Rainbow yawned. "This is the most boring thing, I've ever done." Pegasus lied down next to the fireplace. Then, one of ornaments on it moved, opening one of the bookshelfs. Inside the secret room was pedestal with black book on it. "Guys, I
think I found something."

Rarity screamed, when she saw the room.

"I'll never gonna go to this...oblivion." She played a drama queen.

Twilight took the book by her magic and clean it from dust with her wing.

"Isn't that... Dark Seal, what Jacob told us about, during Changelings' attack?" Fluttershy said scared.

"Spooky." Pinkie said, lighting her face with a flashlight.

Twilight only smiled at the old book. She tried to open it, but it was no use. She tried to use dark magic to open it. It worked and book opened. Before she could even look inside, someone closed it. It was Jacob.

"No matter what, do not read that book!" Jacob said, with scared face, then he burned it.

It was a huge mistake. From inside escaped shadow with green eyes, emanating with purple mist. It was King Sombra, who started to laugh blackly. Jacob's brain clicked and his left eye started to madly blink.

"FFFFFFFFFFUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUU..."

A few moments later...

"...UUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUUCK!!!"

Rarity fainted, from hearing curses. Well, it was one, but pretty long. When Jacob was screaming, Sombra turned into his flesh form.

"First Blizzard Breath, now Sombra. Who next? Tirek? Nightmare Moon? Hell. Maybe fucking Chrysalis will, by the fucking mirracle, rise from death! I don't FUCKING CARE!" It wasn't Jacob. It was Celestia.

"Marry me." Jacob wispered to himself.

Main 6 dropped their jaws.

"You've done?" Sombra asked, borred of this situation.

Before anyone could do something, Jacob grabbed Sombra's neck and absorbed his magic.

"Now, we've done." Jacob said, droping unicorn on the ground. "One villain is already enough." He said, looking at his right hand, covered in black mist. Jacob blew it off.

Sombra was unconscious, but alive. Celestia looked at Jacob.

"Why did you do that?" She asked.

"I need it to cure Crystal Heart. Only dark magic can destroy this ice. And Sombra had enough for this." Jacob said, creating dark purple fireball.

"What about him?" Twilight asked, pointing at fainted, black unicorn.

"It's only a theory, but I think, he won't be evil anymore. But, if he'll still be evil, I'll handle it. But now, we should go."

Jacob, Celestia and Main 6 made their way to the Crystal Heart, where already was Princess Cadence.

"So, you're Jacob Dracons?" Cadence asked. "It's nice to meet you."

"It's nice to meet you, too, Your Highness." Jacob replied politly.

"Call me Cadence. So, are you really able to cure Crystal Heart?"

Jacob examinated the artifact. It was all covered by black ice. It was literally beating with cold and frost. Jacob cracked his neck and fingers.

"There's only one way to see." Jacob said.

Human touched Crystal Heart and covered it with dark fire. From the buttom of crystal was droping liquid dark magic. But
Jacob noticed, that his arm was turning into black crystal. He couldn't stop casting the spell, or even move. Even, when ice was completely gone.

"HELP!" Jacob screamed. "I can't stop!"

His body was shortly turning into crystal. Twilight took the closest thing, what was the chair, and smashed Jacob's arm.

Spell was stopped and Crystal Heart was clean, but Jacob was laying on the ground, half crystal. Everypony saw, that he's suffering from it. He couldn't even speak. He was only crying and breathing shortly. Princess Cadence took him into castle and called for every medic in Equestria. Everyone was worried about him, mostly other princesses. No one known, what happened to him, even Discord. Princess Luna put him into a coma, to stop his suffering. The half of his body was turned into a black crystal, even half of his face. His arm didn't grow back. He was just like this for three weeks. Then, one night, when Twilight was watching for him, she heard a single word from him. Ray...

Author's Note

Another cliffhanger, but little longer chapter. Something for something.
Some darkness with a dash of humor is always good. That's what I think. See ya, folkes.