materiald, still camera, octane hair mat
default mat body, with camera motion following tendrils/appendage
viewport render
did a bit of a sculpting exercise for the body, wanted it to be gross and fleshy but still some kind of inorganic top layer visible.
decent amount of RnD trying to figure out this effect, unfortunately I was unable to achieve the final stage of the effect which would be an object takeover with different vein systems engulfing/assimilating whatever it is, like the Thing :)
Used both xparticles and the native *new* c4d 2023 rope sim tools