I took an empty stable group with me and had 0 creatures. (why possible?)
When I selected my REALM stable group with six creatures I still had 0 creatures (it had an avatar in it).
I had to summon or take a creature out of the stable to make the game playable again.
I can also breed away my last creature and not be able to access items (stuck)
If I had no cores to summon, creatures in stable, or was broke I would be stuck.