This is quite the submission. I am not sure it needs all the text you have given it, some simple ideas as far as invading the town and the final battle might have gone farther for a DM than fully detailing it all yourself. The base concept is great, but I think the name is a bit misleading given that it is a fragment of deamon and not actually a spirit of flora. Overall thumbs up.
Highly disturbing with a good origin, but I simply do not see many applications for this in a game. The base concept would be as a foe or trap, but why not use a tentacled monster than irk your players with a construct?
Plots (Coincidence) (Side-Quest)