Open the door slowly and be prepared to whack anything hostile with the sharpened chair leg. If there is nothing hostile smash up a corpse so they know you mean business.
You slowly turn the door knob and pull the door inwards, you see some sort of partially melted thing, it was probably those creatures that hand the fingers in the door before, they are now all almost melted together in a slurry of blood, and black/grey liqued with a few solid chunks here and there... They is still twitching...
Making sure that its dead you go absolutely nuts on the solid parts of the creatures, bashing and bashig it with your clubs, the twitching stops after a while but you continue to do so as you havnt realised it yet...
What would seem to be an hour to a passerby watching it, is actually a minute or two... or five, and now the creature is almost fully liquid...
Your club now has the black liquid and blood on the tip.
Check yourself for weirdness, why were you able to smash a corpse apart and across the room with just a chair leg? (Corpses are heavy, and still kinda durable.)
Take a little string of the cooked meat and taste it.
(Well the corpse was hanging and you dont know how LONG it has been hanging, and what the hell it is... also take note it has been mutilated and can/has been mutilated in some parts more than others, also the table legs are awsome.)
You check yourself for any oddities.
You notice none on the physical side.
On the mental side however, you do feel more relieved and less stressed after beating the solid chunks of the creature into liquid, part of this tells you are enjoying the bloodshed...
You rip a tiny part off of the cooked arm meat and taste it.
It tastes like dog, although you have NO idea where you know this from...
There are no side effects.