Something or Other is a world I created based on the Warriors book series.

It is inhabited by four Clans, GrottoClan, MarshClan, LightClan, and OpalClan.
family tree: https://www.familyecho.com/?c=dz8xzs89jjuc6u67&f=867235407849625075

GrottoClan: lives in a cave in a forest, they eat mostly fish. Value fighting and swimming skill. Are seen as evil or deceitful by other Clans. Cats have strict mates and cross-Clan kits are not allowed.
The shamans and healers from GrottoClan learn to grow herb gardens.
OpalClan: newest Clan, they live in dens in a gulley and hunt forest prey such as birds and squirrels. They are often seen as naïve by other Clans, especially GrottoClan, which they split off from.
MarshClan: split off from LightClan long ago and lives in raised dens in the marsh. The dens are built from rocks, mud, and sticks. The Moonpetal Grove is on the edge of their territory. They are looked down upon by LightClan cats, while the other Clans find them dull.
LightClan: formed alongside GrottoClan, they are the largest of the four Clans. Their dens used to be in the side of a cliff, but as the Clan grew they moved to a larger camp in a moor and use the cliffside camp only in extreme weather. Their shamans often travel to Twoleg dens to study and collect objects, and are the only Clan that can start fires. They value hunting skill, pride, and morals. Other Clans sometimes see them as proud.