At time code 1:43:28 of That Time I Got Reincarnated as a Slime: The Movie – Scarlet Bond (Cruncyroll), Rimuru toasts, "Here is to the future of the Kingdom of Raja and Tempest". Nothing else is said about that. As far as I know, Tempest is not a Kingdom, and even if it were, he toasts to the "Kingdom" not to the "Kingdoms". Perhaps Raja has been added to the Jura Tempest Federation?
Were the two nations suddenly tied together as one entity, or is that just a typo or poor translation?