These are going to be terms that will be explained. Some will be thoroughly explored during the story and more exposition will be dropped then 

Protagonist: Lucian

- Tall, Black Hair, dark brown eyes, muscular.

- a Traversed imbued with the Dragon Calamity. 

- He is a young man that currently has some of his memory jumbled. But his base personality is the same; an easygoing guy who hates being controlled and would rebel

- Back in his world, he was a pretty athletic guy who had geeky hobbies such as playing video games and reading manga. He was also practitioner of some martial arts.

- He was already good at many things he did, but he doesn't remember that part and the majority of his life, only some recent events and spots of his past, everything else is a hazy blur.

- he will learn the truth along the way.

Traversed: Humans crossed over from the real world to Infernis by the Soulway. They possess the unique potential to be incredibly powerful sorcerers, even compared to natives of Infernis. According to Brodin, not all Traversed unlock their potential and they eventually become failures, shells of their true potential.

Traversed that unlock their potential and become capable sorcerers are highly sought after by all the factions in Infernis. 

When crossed, a Traversed will become one of three: A Sorcerer, A Graced One, or a Cursed One. 

Infernis: The Mortal Plane, separate from the real world in this other universe. It houses several continents but the main one is Terra, the supercontinent that contains most of the Mortals. 

Soulway: an extradimensional vortex of power that sucks in Humans from the real world, imbuing them with magic. 

Magic Types:

- Sorcery (Sorcerers)

- Grace (Graced One)

- Calamity (Cursed One)

Factions: 

- The Order: A large and powerful organization of Sorcerers that has 5 Sects, controlled by their own Arch-Magus. Their purpose is to eradicate Demonic Threats. 

- Free Kingdoms: Free Kingdoms are allied Kingdoms in regions of Terra that are not under Imperium Control. They are their own Kingdoms, with their own military, and they have their own formidable forces of Sorcerers. 

- Demonic Legions: The main antagonistic forces of Infernis; The Legions have threatened the Mortals for Millenium, just recently declaring War on them. One of them, Led by a certain Demon Lord has successfully breached Infernis, kickstarting the Unholy Crusades. 

- The Imperium: The largest and most powerful dynasty of Humanity (Note: Humanity). They have the largest and strongest Military, even compared to the Free Kingdoms and The Order combined. They are indifferent to the Unholy Crusades. 

64 Seals of Infernis: A Powerful Sealing magic that is used for Calamities, used by The Occult Sisters. The sole purpose of the Seals is to keep the Calamity in control. There are 64 Seals, one-by-one, they have to be undone by the user gaining absolute control of the regulated power. It can be broken abruptly but the prerequisites are complicated and luck-related. 

Mortal Races: 

- Humans

- Traversed (Human Subtype)

- Elves

- Fey

- Dwarves

(Should be noted that Elves and below won't appear till much later on, but they're mentioned.)

Monsters/Beasts: 

- Ogres

- Onis

- Gargoyles

- Many others (Surprise/Spoilers)

Entities: 

- Demons

- Chaos Demons

- Archfeys

- Dragons 

- Angels

That would be it for now. Please read and enjoy this story and thank you for any support.