What she said ^. The political socials are very obviously a battleground teeming with parasites and curses, good on you for noticing and keeping hold of yourself.
The bleedthrough of the strange alien creature could be an impostor trying to piggyback on your connection to the Rudlos egregore. It might not have been related to the work directly, but, to argue against myself if you follow the ancient aliens theory at all, what if Rudlos was a reptilian ET of some kind? Just blue skying.
Did you have wards up and banish the space beforehand to limit freeloaders?
Someone wrote up thier way of recognizing impostors, linked here: