I think it would be an impressive work if someone could do an OP boss. Please do not get offended but i think the serpent god was not hard enough. If something, i would make a new quest at Missionpoint by Barking Dogs or something like that, the lil' fawn, and the quest could be something like "Monster Shepherd" And the quest would go:
Ohh, geez! That horrible dog has been haunting my dreams ever since i went to Playground. Go find and kill it! Bring me back his collar as proof.
(The Monster Shepherd would just be a bigger sized Shepherd with some details in (Maybe reddish eyes, dripping blood or rabies?, stuff majorly texture-wise). The new mesh would be the collar, which would be a torn spiked collar with a chain stranded to it.)
I don't know, i think this would be a good idea for a new quest.
I was going to place the Quest suggestion somewhere else but i couldn't find any fitting places for it.