Cernlia: the human kingdom closest to the story's main locations, bordering on the Great Forest. This country includes the Lyns March, on this border, which includes Neralt Village/Forest's Haunt and Fort Forest's Watch.

Nerlia: a neighbouring and allied country to Cernlia, and currently in conflict with the elves.

The only polity of elves for a large distance. It contains little more than the City of Ariedel, inside the Great Forest. It has a largely democratic structure and a professional military.

Mentioned so far:

Alianais, goddess of Change and Progress

Benerron, god of Struggle, colloquially called god of monsters

Deirianon, god of Peace

Leianaleine, a minor goddess

other major gods: Gediarno, Etainas

Enais of Ariedel (or Enais Eltarianal), Special Minister in the Free State's government;

her daughter, Anuis Eltarianal, Forest Ranger (at first appearance), elvish officer; Bianorn, another elvish officer; Niolin, a Commissar; Ceinelis, a (former?) noncom; and others

Tikelikel, Light Mind, and Tikimaken, Unbroken Rock, gnomish merchants and members of the Historicals faction.

Pernaken, Unbroken Rock, government agent (?).

Perikeman and Erdeken, Tikimaken's friends/acquaintances.

Commander Serdakeni, Captain Ediakin and General Aliekin, officers.

Dekilakel, leading member of the Historicals.

Beware of spoilers!

Members of the hive: [(Only some charactes will be mentioned, I don't want to list every drone.)]

Regina: Hive Queen. Our protagonist. Has some knowledge of a more technologically advanced world, but no corresponding personal memories.

Max, her first drone, Warrior; Tim, same; Mia and Tia, Workers.

Bea, Ina, other Workers, and Ben, Dan, Zoe, Eva, other Warriors.

Ada, Scout; Ace, Ash, also.

Ivy, Harvester; Zac and others as well.

Len, Lou, Lea; Shooters.

Ira, Via, Ray, Ria, Attendants.

Ken, Witch.

Jem, Ida, Keepers.

(various others.)

A small horde of nameless Swarm Drones.

Dark and Arcanis, integrated monsters.

Janis, demihuman (see entry under 'Cernlians').

Humans from Cernlia who have so far appeared in the story:

Baron Elric Neralt, lord of Forest's Haunt; his relative, Marianne Neralt; Alan, a soldier; and others.

Janis, aspiring mage, recently from Forest's Haunt (listed here for convenience's sake; may not be (entirely) human); Sir Richard, her relative; Marian, her aunt.

Marquis Lyns, the lord of the march; his daughter, Lady Kiara Lyns, an Arcane Warrior; his wife and her mother, Lady Florance Lyns; their younger daughter, June Lyns

Derrek Zephyr, a high-level Thaumaturge in the service of the king.

The Brazen Blades, a mercenary/adventurer group signed up for the war: Ulric, Weaponmaster; Gavin Barkle, Cleric of Alianais; Oswald Oak, Shaman; and others.

John Cern, a Cernlian lord, and assorted followers.

Earl Alain Whitor, of the county north of Forest's Haunt/most of the Lyns march; Sir Edmund of Whitedale, his bastard son

Duke Bluegrass, a supporter of Marquis Lyns (and especially Kiara); his eldest daughter Margaret; followers including Baron Caleb Theraln and others

Delvers who have so far appeared in the story:

(This lists some basics the characters know about the System, may not be complete or even entirely accurate.)

Stats: Con (Constitution), Str (Strength), Dex (Dexterity), End (Endurance), Int (Intelligence), Wis (Wisdom)

Stat points are usually assigned automatically, with one point given for each level.

Humanoids, Demihumans and Monsters: People and creatures are generally divided into being humanoids like humans and elves, demihumans, and monsters. However, these are somewhat artificial distinctions. In principle, humanoids and demihumans choose a Class, while monsters do not have one. Humanoids cannot level up further than Level 10 without a Class.

Tiers: Every twenty levels, at levels 20, 40 and so on, people undergo Class Evolution (colloquially) or Class Progression (the technical term). Monsters undergo Evolution, which includes physical changes. Demihumans may also undergo physical changes when evolving/getting a new Class.

Abilities: This includes Class Skills. These are special features granted by the System that would not otherwise be possible for someone to do or have. Skills can be active or passive (or appear to be both).

Spells: Spells are usually exclusive to those with mage-like or adjacent Classes. They require having a mana pool. For a Spell, mana is shaped according to a specific pattern, which may be granted by the System for leveling up or learned from books or teachers, or even discovered naturally. Spells take a certain amount of mana from the user's mana pool to create a variety of potential effects. Spells can be upgraded to more complex (and costly) Spells.