The Factions

Karkoth Empire:

50% evil, 50% chaotic

ghouls, zombies, wraiths, skeletons, dracoliche, black arks, necromancers,  night stalkers

unusual stuff you might see in this area

plagues of bats, wolves
corruption, cultists, sacrifical circles
werewolves, bound demons
zombie-hulk, sculpted undead flesh and bone
deathknights, nothic
fallen temples, ancient ruins,

underside- ghoul kingdom, drow cities

The Iron Circle:

50% lawful, 50% evil

hobgoblins, bugbears, iron golems, red dragons, triremes, pact magic and warlocks, vestiges

unusual stuff you might see in this area

Humans in pacified farmlands ruled by...

goblinoid samurai

enchanted stone and iron statues, gargoyles

efreet, dao, fire giants 

hydra, hell hounds, doom bats

gibbering mouthers, chimera and warped creatures

volcanoes and chaos rifts

underside- troll barbarian holds, duegar cantons

Vailin Alliance:

50% good, 50% chaotic

elven archers, nobles, treants, cerilian dragons, skycutters, illusionists and sorcerers, sprites

unusual stuff you might see in this area

swarms of small fey creatures
verdant lands empowered by gaia

warbears, dinosaurs

flying fortress

nagas and storm giants sworn to pacts

a lot of flight, missile weapons and invisibility or illusion

underside- myconoids, feywilde

Nerathan League

50% lawful, 50% good

adventuring heroes, knights, stone giants, abjurers and sages, cogs and carracks, silver dragons, celestials

unusual stuff you might see in this area

draconians

colourful knightly orders

refugees from other areas
blessed lands and consecrated buildings
towns with both dwarves and humans
miles of ruined cities, deserted lands

underside- deep gnomes, dwarves