I know that the Latin words for "gate" and "world" are porta and mundus, respectively. However, while I know how to write "Gate of the World" in Latin (Porta Mundi) since both "gate" and "world" are singular in the English phrase, I'm not sure about doing so for "Gate of Worlds".
Do I write it as Porta Mundorum, using the plural genitive of mundus? Or do I use the adjective mundanus and, following the example of "Star Wars" being rendered as Bella Stellaria in Latin (where stellaria is in the neuter nominative plural case), write it as Porta Mundana? Or are both approaches correct? Or are they both wrong?
PS: The phrase "Gate of Worlds" is supposed to emphasize the fact that the gate in question connects several worlds together.