One day, a mysterious explosions occurs near Earth and rewrites reality, as hundreds of thousands of people become ''Players'' and ''Monsters'' now exist. You have transformed into a Player, which besides gaining a body that looks like your ideal self, it means that you obtain the following powers and abilities...
Language Comprehension: A basic ability to all players, allowing the user to understand the language of others after a few seconds, being able to speak back in that language. However, it doesn't allow the user to learn how to read it or write on those languages.
Appraisal: Allows one to determinate the traits and talents of oneself or others by the use of ''Stats'', displayed in a holographic window. Each being is assigned seven types of stats (Humans have an average of 5 in everything except magic, which is a 0), those being Strength, Dexterity, Constitution, Intelligence, Health, Magical Talent and Charisma. Unlike in other ''stories'', it doesn't show the name, age, gender, race and skills of people until the user learns them, which then are registered within the stat list.
Inventory: A personal pocket dimension to store up to 60 items, but you can stack 99 identical items in a single slot. Inside this dimension, times flows much slower and it almost seems frozen, so food and water will remain the same condition as it was saved. While weight won't be an issue, you cannot save very large things like cars or living beings.
Monster Slaying-based Growth: Monsters are artificial creatures, whose true selves are a ''Core'' located on their bodies and use the surrounding Mana (Magical Energy) to create their bodies, so they don't reproduce like actual creatures and instead ''spawn'' in areas with high concentrations of mana. When a player kills monsters, it absorbs their mana and ''levels up'', allowing it to obtain better abilities by accessing a class or increase the one it already possesses. The strongest the monster and the amount of damage you deal to it, will grant you more rewards in the form of more mana to absorb or materials to craft special weapons. However, just because you gain a skill, you don't instantly know how to use it and still need to train with it to unlock its true power.
Titles: By performing certain actions, one can gain a title that magnifies that trait in future conflicts. For example, gaining the title of ''Goblin Killer'' will develop a talent of slaying goblinoid-type monsters.
Class System: When a player reaches Level 10, it will unlock one of the three main classes are Warrior, Mage and Ranger. That process depends on the actions taken during the leveling process, like if you used magic more then you're class will be Mage. When becoming part of a class, a player will have access to a Skill Tree and obtain abilities based on their class. Then, when one reaches Level 50, a player can access a Sub-Class related to its main class and once again, depending on how it used its skills. A very violent warrior will become a Berserker, a mage that uses nature-based spells will become a Druid and a Ranger that uses potions to deal damage will become an Alchemist.
Once a player reaches Level 100, it's invited into the Valhalla, a parallel dimension for those players who have reached the ''level-cap''. There, a player will have to win three labors based on how it reached level 100 and depending on the results, several fates will occur...
0/3: Death by lightning strike.
1/3: Return home, but start back from Level 50 if you're lucky.
2/3: Be granted one wish, but no reviving the dead, changing the past or impossible wishes.
3/3: Ascend into godhood and become a deity in another world.
What will you do in this new world? How would you level up? Do you think you could reach Lv.100 and survive Valhalla?
Extra: This scenario is based on Solo Leveling, Omniscient Reader and the Leveling System CYOA. Another thing is that, while magic now becomes real, you cannot change the past, see into the future with 100% accuracy, conjure things from absolutely nothing or truly revive the dead, as even high-tier Necromancers can only keep someone around as a subservient undead and it will die when its master does.