This was the word I was looking for:

entelechy (en-TEL-uh-kee) noun

1. Perfect realization as opposed to a potentiality.

2. In some philosophies, a vital force that propels one to self-fulfillment.

[From Late Latin entelechia, from Greek entelecheia, from enteles (complete), from telos (end, completion) + echein (to have).]

As in (Ern Malley again): An entelechy of clouds and trumpets