The Twenty Worlds are the limit of known, civilised space. They are, in alphabetical order:
Atlasis (Sipiricol II), the water world with it's famous floating cities.
Bothom (Avalyn I), renowned for it's plant life.
Crotliv (Riptiss III), home of democratic government, and arguments.
Dresden (Thanosh IV), the dead world, site of the Last War and the summoning of Kali-Mar, the death of gods.
Erepodi (Zithos Cir II), best beaches in the Twenty Worlds.
Gant (Pollea III), home to the natons of Nuinam and Orontiph. The moon, Beremet, is populated.
Gederi (Gederi I), origin world of the human species, and home of the oppresive Theocracy of Light.
Haredda (Yrri II), a gas giant, where thirty-eight Dwarven cities float within it's atomsphere.
Haven (Sastoc Asteroid Belt), asteroid city, free and open. Ruled by the Twelve, the greatest mages of all the worlds.
Kaelot (Corepitos III), home of the United Nation-States of Urthan, the Lethinor Kingdom, and the Serigan League. Of particular note, all native fauna is mammalian.
Kish (Gederi III), resort world, famous for the dreaded Gamecubes of Kish.
Leisarn (Rioh IV), a world only Dwarves could love; rocks, rocks, more rocks, and constan storms. Leisarn is rumoured to be the Dwarven world of origin.
Lo Bidar (Yequisonn II), once the 'world of a thousand kings', since the Last War the number of crowns has shrunk to six or seven.
Mystalis (Celestiad IV), last outpost of the Elven Imperium within the Twenty Worlds. Every year or two they make token attempts to enforce their laws.
Palamad (Omnicros II), parched homeworld of the Orc race, and former capital of the Forces of Darkness.
Retridine (Onithor IV), playground of the Halfling corporations.
Slyva (Sorcerec III), world of magic, home of the mysterious Fey. More elves reside on Sylva than on any other world.
Tiomon (Zithos Cir III), the best and most famous universities are here, as is the headquarters of the mysterious 'Lords of the Five Chains.
Westron (Thesaphales IV), barbaric home of the four-legged folk.
Zairc (Corpridid V), cold and volcanic.