Yea, there was a cool old abandoned church I was walking through and where the pulpit would be was a large mass of floating, writhing black tentacles glowing red kind of Princess Mononoke like, and they began pulling me in and then wrapping around me and suffocating me.

I was practicing lucid dreaming at the time though, and i had recently become skilled enough that I was able to sort of stop myself from being suffocated and emerge out of the monstrous energy and dismiss it while staying inside the dream.

and that experience was so cool I actually did will myself back into the nightmare a couple times just to "defeat the evil" again in subsequent dreams.