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Dark Sun is different from traditional D&D
Many monsters, prestige classes, spells or magic items from the core rulebooks simply are not available in Athas. Many races were extinguished from Athas during the Cleansing Wars. This is because Athas has a very different background than most D&D settings.

Athas puts the survival of the fittest concept to its fullest. Those who cannot adapt to endure the tyrannical Sorcerer-Kings, the unrelenting sun, or the many dangers of the wastes will certainly perish. Illiteracy and slavery are commonplace, while magic is feared and hated.

The basic necessities of life are scarce on Athas. This means that every society must devote itself to attaining food and safeguarding its water supply, while protecting themselves from raiding tribes, storms, and other city‐states. This essentially means that most Athasian must devote a large portion of their lives just to survive.

The World is a Desert: Thousands of years of reckless spellcasting and epic wars have turned Athas into a barren world, on the verge of an ecological collapse. Athas is a hot, arid planet covered with endless seas of dunes, lifeless salt flats, stony wastes, rocky badlands, thorny scrublands, and more! From the first moments of dawn, the crimson sun beats down from an olive-tinged sky. Temperatures routinely exceed 40 degrees by mid-morning and can reach 70 degrees by late afternoon. The wind is like the blast of a furnace, offering no relief from the oppressive heat. Dust and sand borne on the breeze coat everything with yellow-orange silt. In this forbidding world, cities and villages exist only in a few oases or verdant plains. The world beyond these islands of civilisation is a barren wasteland roamed by nomads, raiders, and hungry monsters.

The World is Savage: Life on Athas is brutal and short. Bloodthirsty raiders, greedy slavers, and hordes of inhuman savages overrun the deserts and wastelands. The cities are little better; each chokes in the grip of an immortal tyrant. Slavery is widespread on Athas, and many unfortunates spend their lives in chains, toiling for brutal taskmasters. Every year hundreds of slaves, perhaps thousands, are sent to their deaths in bloody arena spectacles. Charity, compassion, kindness—these qualities exist, but they are rare and precious blooms. Only a fool hopes for such riches.

Metal is Scarce: Metal's scarcity has forced Athasians to rely on barter and different materials, such as ceramic, to use as currency. It also hampers industrial and economic development as well; mills and workshops rarely have quality tools to produce everyday products. Even though most Athasians have developed ways of creating weapons and armour made of non-metallic components, the advantage of having metal equipment in battle is huge. Most arms and armour are made of bone, stone, wood, and other such materials. Mail or plate armour exists only in the treasuries of the sorcerer-kings. Steel blades are almost priceless, weapons that many heroes never see during their lifetimes.

Arcane Magic Defiles the World: The reckless use of arcane magic has reduced Athas to a wasteland. To cast an arcane spell, one must gather power from the living world nearby. Plants wither to black ash, crippling pain wracks animals and people, and the soil is sterilised; nothing can grow in that spot again. It is possible to cast spells with care, avoiding any more damage to the world, but defiling is more potent than preserving. As a result, wielders of arcane magic are generally reviled and persecuted across Athas regardless of whether they preserve or defile. Furthermore, very few are able to tell the difference between divine and arcane magic. Only the most powerful spellcasters can wield arcane might without fear of reprisals.

Sorcerer-Kings Rule the City-States: Terrible defilers of immense power rule the city-states. These mighty spellcasters have held their thrones for millennia; no one alive remembers a time before the sorcerer-kings. Some claim to be gods, and some claim to serve gods. Some are brutal oppressors, where others are more subtle in their tyranny. The sorcerer-kings govern through priesthoods or bureaucracies of greedy, ambitious templars, who can call upon their god-kings’ powers.

There are no Gods: Athas is a world without deities. There are no priests, no paladins, and no prophets or religious orders. In the absence of divine influence, other powers have come to prominence in the world. Psionic power is well known and widely practised on Athas; even monsters can have deadly psionic abilities. Clerics attune to a classical element and druids call upon the primal powers of the world. Athas is a world without true deities. Powerful sorcerer‐kings often masquerade as gods but, though their powers are great and their worshippers many, they are not true gods.

Fierce Monsters Roam the World: The desert planet has its own deadly ecology. Many creatures that are familiar sights on milder worlds have long since died out or never existed at all. Athas has no cattle, swine, or horses; instead, people tend flocks of erdlus, ride on kanks or crodlus, and draw wagons with inixes and mekillots. Wild creatures such as lions, bears, and wolves are almost non-existent. In their place are terrors such as the id fiend, the baazrag, and the tembo.