The realm of Iorth is familiar to many who may know of Dungeons & Dragons. However, there are some qualities of settings based using Dungeons & Dragons that do not directly match with elements in the world of Iorth. As such, here are some simple tables that makes comparisons between elements found in a D&D setting that would be different (or even non-existent) in the world of Iorth.

Cosmology

The various extradimensional spaces beyond Iorth are notably different from how they appear and are referred to in a standard D&D campaign. For Iorth, the cosmos exists as a cosmic axis within the Astral Plane, which has Heaven at the highest end and Hell at the lowest end. At the center of the axis is the Prime Material Plane, Iorth, and its corresponding transitive and reflective planes with it. Orbiting the cosmic axis are the elemental planes, and several demiplanes.

D&D Concept	Iorth Version	Category	AL	Notes
Astral	Astral	Transitive	—	As per source material. Has a diaspora of light elves, as well as colonies of githyanki and githzerai.
Elemental	Elemental	Plane	—	Four separate planes, each of which orbit the Prime Material Plane.
Ethereal	Ethereal	Transitive	—	As per source material.
Far Realm	The Horror	Demiplane	NE	A strongly bizarre, alien, and malign plane. Home of several aberrations.
Feywild	The Shimmer	Reflective	CG/CN	Home of the light elves and many fey. A plane with CG/CN tendencies. Contains multiple Domains of Delight.
Limbo	Chaotic Maelstrom	Demiplane	CN	Source of the slaad, grung, grippli, and bullywugs; has infestations of hezrou demons and hydroloths.
Lower Planes & Negative Plane	Hell	Plane	NE/CE	Overall equivalent to Carceri/Tartarus. Home of the infernal city of Pandemonium.
Mechanus	Orderly Pattern	Demiplane	LN	A subset of this realm, known as The Gears, is the source of construct-like beings such as modrons, autognomes, and warforged.
Prime Material	Prime Material	Plane	—	The default plane of the setting, where the world of Iorth exists.
Shadowfell	The Shadow	Reflective	LN/LE	Home of the dark elves and many undead. A plane with LN/LE tendencies. Contains multiple Domains of Dread.
Sigil & The Outlands; Radiant Citadel*	Aushaus	Demiplane	N	A bizarre magitechpunk extraplanar realm where beings of all planes of existence and realities congregate. An amalgamation of Planescape, Spelljammer, Eberron, and Ravnica; also can have Radiant Citadel elements present.
Upper Planes & Positive Plane	Heaven	Plane	NG/LG	Overall equivalent to Bytopia/Twin Paradises. Home of the celestial city of Arcadia.

Folk & Creatures

The various beings of Iorth and its cosmological reaches, and how they vary from a standard D&D campaign.

The varieties of dragons that exist in Iorth is meant to purposefully echo the six varieties of dragons encountered in the Basic D&D Red Box set of the early 1980’s. Furthermore, some beings, such as deep gnomes, duergar, derro, kuo-toa, sahuagin, and the like do not exist in Iorth, though there are beings similar to them in the same environments found in Iorth. Finally, certain creatures like particular aberrations or monstrosities that could be deemed “iconic” for D&D are not creatures native to Iorth at all, but are actually extradimensional invaders from within and far beyond the demiplane known as the Horror.

D&D Concept	Iorth Version	Notes
Aasimar	Angelkin	The current descendants of ancient humanoids who interbred with deva angels and titans.
Basilisks & Cockatrices	Basilisks & Cockatrices	In Iorth, the basilisk is a large legless serpentine creature that can display a hood when threatening, much like a cobra. In addition, “cockatrice” is the term for a hatchling or juvenile basilisk, which cannot petrify victims with a gaze, but can do so through a bite.
Bugbears	Bugbears	Though generally the same statistically, they are now the same height as hobgoblins (between 4’ and 5’ tall). Most serve as bodyguards and enforcers for prominent goblins or hobgoblins.
Changelings	Changelings	The current descendants of ancient humans who interbred with fey.
Demons & Tanar’ri	Demons	The prisoners of Hell, who are watched over by the devils. They are opposed by the titans.
Derro	Derogar (Troglodytes)	The twisted, insane descendants of dwarves and gnomes interbred for use by the nightmarish creatures from the Horror, the derogar, or troglodytes as they are commonly known, are the dominant culture dwelling in the depths of the Nether Lands.
Devas, Planetars, & Solars	Angels	All three of these celestial entities are known as angels, who reside in Heaven. They stand in opposition to the devils.
Devils & Baatezu	Devils	The jailers of Hell, who watch over the other fiendish beings imprisoned there. They are opposed by the angels.
Dragonborn	Drakin	The current descendants of ancient lizardfolk who interbred with dragons millenia ago.
Dragons, Black	Black Dragons (Iron Dragons)	They are Chaotic-aligned by default. Good, benevolent black dragons are known as iron dragons, who gain the shapeshifting ability of metallic dragons.
Dragons, Blue	Blue Dragons (Sapphire Dragons)	They are Lawful-aligned by default. Good, benevolent blue dragons are known as sapphire dragons, who gain the shapeshifting ability of metallic dragons.
Dragons, Gold	Yellow Dragons (Gold Dragons)	Yellow dragons have a thunder-based breath weapon only, and lack the shapeshifting and secondary breath weapon of metallic dragons. They are Lawful-aligned by default. Good, benevolent yellow dragons are known as gold dragons, who gain the shapeshifting ability of metallic dragons.
Dragons, Green	Green Dragons (Emerald Dragons)	They are Lawful-aligned by default. Good, benevolent green dragons are known as emerald dragons, who gain the shapeshifting ability of metallic dragons.
Dragons, Metallic & Gem	—	Actual metallic and gem dragons are not indigenous to Iorth. They may be encountered in a demiplane or in Aushaus.
Dragons, Red	Red Dragons (Ruby Dragons)	They are Chaotic-aligned by default. Good, benevolent red dragons are known as ruby dragons, who gain the shapeshifting ability of metallic dragons.
Dragons, White	White Dragons (Silver Dragons)	They are Chaotic-aligned by default. Good, benevolent white dragons are known as silver dragons, who gain the shapeshifting ability of metallic dragons.
Elves, Astral	Light Elves	Native elves of the Shimmer (Feywild), though many now reside in the Astral Plane. Have white hair and skin, with intense blue or green eyes. Naturally ambidextrous.
Elves, Drow	Cave Elves	A naturally subterranean-dwelling elf heritage. Generally look the same as drow elves from D&D.
Elves, Eladrin	Fey Elves	Native elves of the Shimmer (Feywild).
Elves, Sea	Sea Elves	Sea elves are said to have traces of triton heritage in their past, which enabled them to live underwater. Many sea elves serve as benevolent guardians and tenders of the waters they reside in.
Elves, Shadar-Kai	Dark Elves	Native elves of the Shadow (Shadowfell). Have black hair and skin, with fiery red or yellow eyes. Naturally ambidextrous.
Empyreans	Titans	The titans are the progenitors and survivors of the long-lost giants of ancient times who reside in Heaven. They stand in opposition to the demons.
Genasi	Jinkin	The current descendants of ancient humanoids who interbred with genies.
Giants, Cloud	Cloud Giants	These giants are hill giants permanently transformed by wearing and attuning to a belt of cloud giant strength.
Giants, Fire	Fire Giants	These giants are hill giants permanently transformed by wearing and attuning to a belt of fire giant strength.
Giants, Frost	Frost Giants	These giants are hill giants permanently transformed by wearing and attuning to a belt of frost giant strength.
Giants, Hill	Hill Giants	The only naturally-occurring variety of true giant that exists in Iorth, ever since the Giant-Dragon War. Many still wear and are attuned to their personal belts of hill giant strength.
Giants, Stone	Stone Giants	These giants are hill giants permanently transformed by wearing and attuning to a belt of stone giant strength.
Giants, Storm	Storm Giants	These giants are hill giants permanently transformed by wearing and attuning to a belt of storm giant strength.
Goblins	Goblins and Kobolds	As generally depicted in D&D, though they tend toward various shades of green complexions. There are some smaller, weaker offshoots who have bluer complexions, who are known as kobolds. Some kobolds tend to be more in tune with learning and developing magic.
Goliaths	Giantkin	The current descendants of ancient humans who interbred with giants millenia ago. Their heritage is too diminished to fully activate and bond with the elemental magics that true giants can use.
Hobgoblins	Hobgoblins	Hobgoblins stem from a mixed heritage of goblins, orcs, and humans. Though generally the same statistically, they are now between 4’ and 5’ tall.
Kenku	Tengu	The tengu are a wingless avian humanoid species that reside in remote mountainous regions. Some of them are shapeshifters, transforming into wereravens.
Kobolds	Saurids and Squamidlings	A smaller offshoot of ancient lizardfolk who reside underground in burrows or cave systems. Some squamidlings mature into larger versions, simply known as squamids.
Kuo-Toa	Deeplings	The deeplings are a subterranean amphibian humanoid species bred by the derogar for use as servants and laborers. They naturally secrete a slippery, rancid substance onto their skin to help them squeeze through tight underground passages.
Medusas	Gorgons	A serpentkin fanatic “blessed” by their serpentine Great Old One patron into their current form, being gifted the powers of a basilisk. They have serpentine tails instead of legs.
Merrow, Sahuagin, & Locathah	Merrow	Merrow are aggressive, predatory aquatic beings who terrorize all life in the sea and on the shore. They hate merfolk and sea elves in particular. Merrow are prone to mutation, with some being larger than normal, having additional limbs, or even merfolk-like tails instead of legs.
Naga & Yuan-Ti	Serpentfolk	Serpentkin fanatics “blessed” by their Great Old One master into a more powerful and horrible form.
Pureblood Yuan-Ti	Serpentkin	Humans who interbred with serpentine beings from the Horror centuries ago, and who now worship a serpentine Great Old One.
Salamanders	Firewurms	Though the same as their in-game counterparts, these evil elemental beings are servants of the serpentine patron of the serpentkin.
Shifters	Werekin	The current descendants of ancient humans who interbred with werebeasts.
Tieflings	Devilkin	The current descendants of ancient humanoids who interbred with incubi, succubi, and cambions.
Troglodytes	Squamids	These creatures are larger and more mature versions of the squamidlings.
Trolls & Hags	Troll & Hags	Trolls and hags are actually members of the same species in Iorth that go through extreme sexual dimorphism when they mature. The offspring of trolls and hags are genderless creatures known as gremlins, which undergo significant transformation when they reach puberty. At the age of puberty, a gremlin randomly develops into a male or female. In males, the giant heritage dominates and the gremlins mature into trolls. In females, the fey (or fiend) heritage dominates and transforms them into hags. Males tend to be the more prevalent among gremlins, but females often develop in groups of three, which many posit as a natural development and establishment of a future coven of hags.
Xvarts	Zwꜷrfts	A magical mutation of mixed gnome and goblin heritage “created” by the ancient mage Melgar. Zwꜷrfts are very aggressive and xenophobic, and often clash with anyone near their territory.
Yugoloths, Daemons, Succubi, Incubi, & Demodands	Fiends or Demodevils	Immigrants from the Horror and the original occupants of Hell, demodevils are servants of the deity of evil.