Seven categories
A category groups families by what their creatures are, across every faction.
BeastWild animals, from lone hunters to horned giants.
CelestralBeings of living light from beyond the dark.
ConstructMachines, built in the forge rather than born.
GrowthThings that grow: flowers, fungus and living stone.
HumanoidPeople: soldiers, smiths, scavengers and survivors.
ShadowWhat the Shadow has hollowed out and made its own.
SwarmHordes of small things that fight as one.
See also the five card types, the thirty families and the whole library.