Below are high-level NPCs and monsters in the Oathbridge region (the name I gave this valley's village). Note that these are faction leaders; some are dungeon level-bosses. Most creatures in this mini-setting are much lower in level and power.
*The Deep God*
The most powerful creature is the nameless Aboleth itself - an 8+2 HD monstrosity, bigger and nastier than the average Aboleth, and also capable of dark sorcery as a 7th level Mage. Also capable of magical research, potion creation, and magical item creation - perfect for rewarding underlings and enticing other people to serve this fish-god. It is, of course, Chaotic and very intelligent. Its goal is to spread its dark influence across the land, gain power, and control as many minions as possible.
Bleeding Talon, the Lizard Chief, is at 6+2 HD. He is a huge, fat lizardman who rules the Swamp like his ancestors did from time immemorial. He occasionally leads his warriors to raid human settlements or ambush caravans, but for the most part, he is content to stay in his village, eat fish, and mate with as many females as possible. Primitive and savage, but not evil or sadistic. Wants to get rid of the Lizard Cult. Neutral.
Burning Eye, the Lizard Shaman, is at 4+1 HD with level 3 Clerical abilities. He is as savage as his king, but wiser. He leads the lizardman religious activity - worship of totems and idols in the swamp. He knows the value of magical items and will hoard any such item he can get his claws on. Harbors burning hatred for the Lizard Cult. Neutral.
The Lizard Pontifex, who has long abandoned his lizardman name, is at 5+3 HD with level 5 Mage abilities. Rapidly evolved by Aboleth alchemical methods, he is a genius in lizardman terms (around INT 12). He built the Lizard Cult into a force to be reckoned with, equipped with advanced equipment looted from humans and organized into an effective military unit. He sacrifices captives to his God by throwing them down the well (which goes down into the Aboleth's lake). He is currently at war with the Goblins and Swamp Lizardmen. Communes with his God telepathically and receives gifts through his Emissaries (the Skum). Chaotic
"Tyrannus" is a monster - a 6+1 HD giant lizardman alchemically manipulated by the Aboleth. He is the cult's champion; as dumb as a rock but as tough as a mountain. Easily controlled by the much smarter Pontifex. His bite is venomous, and he wields a massive warhammer looted from the Dwarven ruins; the Dwarves built this weapon for two-handed use, but such a huge reptiloid can hold both it and a massive iron shield. Chaotic.
The Goblin King Burguk is at 4 HD - stronger than most goblin chieftains. He used to terrorize the countryside with his goblin warbands, but now the Lizard Cult has inflicted a painful toll on the goblins - only two Warbands remain. Wants to stuff his face and belly with cakes and humanoid flesh all day, as all goblin kings do, but first he has to get rid of the Lizard Cult. Chaotic.
The Goblin Shaman Nazal is at 1+1 HD, but has level 3 Clerical abilities. He wishes to sacrifice captives to the dark goblin spirits, but before that, he wants to rid the goblin tribe of the Lizard Cult threat. He will begrudgingly agree to parlay even with non-Chaotic characters if that furthers the end of combatting the Lizard Cult. Chaotic.
The Goblin Witch Urinn is at 1 HD, but has Mage abilities at level 4. She is smarter and meaner than other goblins - and even literate - and has interest in magical research. She will torture captured spellcasters to learn Arcane secrets, but will also trade in magical items and lore with strong characters she knows she could not subdue. Chaotic.
Castellan Edmund of Oathbridge, the local ruler, is a level 4 Fighter. He is a capable warrior, but he 22 years old and a mere five years on the throne and is not a good ruler, even though he does try to manage his manor fairly. The matters of state do not come as easy to this young man as warfare does. He prefers to spend his time hunting or sparring rather than deal with the boring and difficult burden of managing his domain. Instead, he lets Gregory, his manipulative majordomo and court wizard, run things. Lawful.
Gregory of Zabreba, the Castellan's majordomo and court wizard, is a level 4 Mage. Older and far more experienced than Castellan Edmund, he Oathbridge's actual ruler. This manipulative politician used his keen knowledge of the archaic and often contradictory law of the dying Empire to install Edmund on the manor's throne instead of his older, smarter sister Rowena, when their father died. This way he could get the power into his hands and also insert his fingers into the manor's coffers. He acts as a tyrant in any way he can get away with without coming into conflict with Edmund. He is Neutral, but the Aboleth is now working on further corrupting this corrupt courtier and turning him Chaotic.
The Bandit Queen is a legendary figure of peasant folklore. Stories about her surfaced a mere few years ago, but now she is a central figure in tall tales and rumor-mongering. She fights, or so the peasant story goes, to overthrow the tyranny of Edmund and Zabreba and institute justice in Oathbridge. "Justice" usually means, in such stories, a major reduction of the extortion taxes levied by Gregory, as well as hanging this rascal and his bully of a Sherriff, Boris. Some even say that she will give serfs their freedom and turn everyone into freeholders. In reality, she is Rowena, Castellan Edmund's older sister. This woman, at the age of 31, is a level 5 Explorer. She is smart, and she also believes that the end always justifies the means and can be quite ruthless. Enraged that her young and inept brother Edmund got the throne, she is determined to take what is hers by the force of arms. For this, she is gathering an army of bandits and rebels to eventually assault Oathbridge, takes its fort, and overthrow her brother. Once enthroned, she will rule with an even hand, but also with an iron fist. Lawful.
Armand the Quick, Oathbridge's chief criminal, is a level 4 Thief, leading a gang of 16 thieves, himself included. His income includes all sorts of petty village crime, burglary in this valley and the surrounding areas, some gambling at the Snoring Dwarf tavern, and other mischief - and also waylaying travelers on the road, in collaboration with the Bandit Queen. He is not an evil man; he is in for the gold. The Bandit Queen is powerful and working with her pays off, so Armand works with her for the time being. He knows very well, though, that if he will be uncareful, he will hang once she takes the throne. Neutral.
Father Frederick, Priest of the Invincible Sun and Oathbridge's religious authority, is a level 3 Cleric. He is a very old, very devout man who has served in his holy post for the past fifty years. He has the villagers' respect but is well-known for being very careful and reserved with magical aid; he does not use his spells lightly and will reject such offer and the accompanying tithe if he suspects that this will serve a questionable purpose. Lawful.
Mother Larissa, the Forest Witch, is a level 5 Cleric of the ancient nature-goddess Marzanna. Peasants whisper dark stories about Mother Larissa, such as that she can turn insolent people into toads (which is correct - she has such a spell in her repertoire), or that she performs blood-rites deep in the woods. There is a certain streak of malice in this old woman, especially when angered, but she is not a villain. Despite her ominous reputation, villagers often consult with her, as she sells effective potions and salves. She also casts magic on behalf of any who pays her with little questions asked, unlike Father Frederick. Even the Swamp Lizardmen respect her, as they know her power very well; they occasionally trade with her as well. She has an enormous number of toads and frogs in and around her garden and has domesticated a giant toad as a guard animal. Neutral.