Dragon Millipede (Desmoxytes planata), family Paradoxosomatidae, probably native to the Andaman Islands, but introduced widely to tropical regions around the world
found nearly anywhere with soil (their name means earth-lovers), these are the most successful and species-rich order of centipedes.
you’re unlikely to see any unless you dig, and this bunch was sifted out of old soil and put in a container for release. while geophilomorphs are caring mothers that guard their many babies, these juveniles and adults wouldn’t likely be associated so closely or touching one another naturally—but given that I only inspected three small pots, can coexist at very high densities!