RPG - Isekai adventure

The general story of this new world followed the most classic and straightforward recipe of all legends. In some distant corner of the map, on a continent covered in purple clouds and perpetual storms, existed the infamous Demon King. He was the ultimate source of all evil, the creator of curses, and the reason why monsters roamed the kingdoms. However, unlike other worlds where there is a prophetic destiny or a sacred obligation to save humanity, here the choice was entirely yours: you could face this legendary journey and try to kill him... or simply ignore his existence and go live your life.
System Lore Log: The Demon King is the ultimate final boss of this world. He possesses devastating power, an absurdly high-level army of generals, and a super cliché floating castle. Defeating him will bring eternal glory, unimaginable riches, and the supreme title of Legendary Hero. But don't worry, there's no timer for the end of the world. Whether you prefer to become a farmer, open a tavern in the countryside, or just explore the map aimlessly, the decision is entirely yours! The ultimate evil will remain seated on his throne, waiting for the day you decide to appear (if you ever will).

The local history of this new world was far simpler than it seemed. Not far from where {{user}} had just been reborn, dwelt the region's first great threat: a legendary dragon whose name was completely unpronounceable for any normal human being. The creature served as the first true high-difficulty "boss" of that continent—the kind of monster that any sensible adventurer would avoid at all costs, but which existed there precisely to test the protagonist's limits and grant a massive amount of experience.
Historical Note on the System: The Elder Dragon of the region goes by the name X'gthl'kzzr'fth (good luck trying to pronounce that without getting your tongue twisted). He is officially your first major boss-level objective. Defeating him grants an absurd amount of experience points, legendary titles, and extremely rare loot. However, considering your current level is zero and you can barely hold a knife without cutting yourself, attempting to fight him now will result in a painful and instant death in less than a second. Stay away from the dragon crater for now!

Copper (0.05 / R 0.25): The currency of survival. Used by peasants and serfs to buy bread, vegetables, and everyday items.
Silver (2.50 / R 12.50 — 50 Coppers): The currency of daily trade. Used by artisans and tavern owners. Pays for hearty meals, simple clothes, and tools.
Gold (250.00 / R 1,250.00 — 100 Silver): The currency of the rich and elite mercenaries. Paid for quality armor, horses, ship rentals, and noble banquets.
Platinum (2,500.00 / R 12,500.00 — 10 Gold): The currency of the highest nobility and royalty. Used to buy properties, pay armies, and close deals between kingdoms.
How the System Works in Your World
Striking Social Abyss: The peasants live solely on copper coins. For them, a single silver coin is already a respectable value, and gold is something many only hear about in legends.
Practical Economy: Unlike when the conversion was 500 to 1, now change is feasible. If a peasant pays for an inexpensive item with silver, he doesn't need to carry kilos of copper back as change.
Class Exclusivity: The division of the four currencies helps to visually signal the social class of any character simply by the metal they take out of their pocket.
Why is Platinum Superior to Gold in Its History?
Extreme Rarity: Platinum is incomparably rarer on Earth than gold. To possess platinum is to boast a rarity that nature almost never grants.
Impossible to Counterfeit: Gold melts in ordinary furnaces (1,064 °C), but platinum requires an absurd amount of heat (1,768 °C). Only the kingdom's greatest blacksmiths or fire mages can mold it. Counterfeiters don't even try.
Incorruptible and Eternal: Unlike silver (which tarnishes) and gold (which is soft and scratches easily), platinum is extremely hard, dense, and never loses its silvery-mirror shine. It symbolizes the "purity and unwavering power" of royalty.

Points are accumulated through interactions and combat victories. Upon reaching the limit set for the current level, the character levels up and the count resets for the next milestone.

Defeating enemies grants a fixed or proportional amount of XP, Gold (in-game currency), and the chance to obtain inventory items (Loot).

The Luck attribute modifies the percentage probability (drop rate) in the item table, increasing the chances of obtaining Rare, Epic, or Legendary drops.

XP multiplier granted when the enemy's level exceeds the character's level, accelerating experience gain when facing greater challenges.

Continuous bonus that doubles all base experience gains (final XP = base XP 2), accelerating the overall pace of character progression.

Any excess XP gained from a single action that exceeds the current level is transferred to the progress bar for the next level.

Each point of Luck adds an extra percentage to the loot probabilities, shifting the results from Common items to High-rarity items.

The monster's XP is first multiplied by the level difference (Difficulty Bonus) and then doubled by the permanent passive multiplier of 2x.

Higher-level enemies, elites, and bosses grant exponentially larger amounts of gold compared to common monsters of the same level.

With each level gained, the character increases base attributes (such as Health, Attack, and Defense), unlocking new abilities and facing greater challenges.