I have returned from my journey in distant lands and since I’ve been back, I’ve identified the monster. With some assistance, I’ve also found how it enters my home every night.
Was it a small goat? A raccoon? A beaver? Sadly, the truth is much more boring than I expected. It seems to be a mouse or possibly mice and the hole in my wall (which was hidden behind the heating vent) is now patched up with some kind of foam. I’m told it will soon be eaten through as well, but in two weeks, the Pest Controller will stop by with better foam. This kind can also be eaten, but is more poisonous. I do not like poisoning things, but this thing is keeping me awake at night and sleep deprivation can be deadly, so the poison foam will be used for self defense.