Causation without causes
The Enlightened One taught that there is no cause or "creator" that was eternal or has immortality, such as; a soul or supreme being that was empirically knowable. The Buddha taught that there was causal conditions that are observable in the material world of form and in the conscious dispositionally conditioned state (samskrta). Simply put, the Buddha did not teach eternalism or annihilationism but that everything/everyone is streaming headlong towards becoming.  Perhaps an example might be useful.  A plant seed does not have an inherent cause within it.  It cannot become a tree in and of it's own.  The potentiality might be there but the tree is not evident.  The seed will not germinate without other causal factors; soil, water, temperature, atmosphere, and etc.  It is the causal conditions of these all these things that then cause the seed to germinate.  Once the seed has germinated, we now have the sprout.  Where did the seed go?  And, we no longer conceptualize the seed but the sprout.  Eventually, we may or may not have a tree because there are other factors (causal conditions) that may effect the tree's growth and longevity.
Even emptiness is empty of a state of a substantiality. Dependent arising is not a string of "moments" but a continuous flow of becoming.  If you are looking for a metaphysical cause ( "a final cause" , a "forever" something) that, is simply not evident.  What the Buddha taught was the means to end the general dissatisfaction we have with life and not a metaphysical philosophy. Nibbana is that liberation from dissatisfaction.