Realize that the monster IS Carver!
Ha, no, seriously, kidding. Let's not immediately try to kill whatever comes nearby, it might not want to immediately kill us either. Friends are important in this mutant, arm-feasting, Power-mad world we live in.
Look for anything nearby that we can quickly use to barricade the door (and then use it). If there's nothing we can use to barricade the door, seal the door shut with iron, then keep looking for a weapon. If we don't find a weapon (which is odd, because Carver REALLY should have or should have made one), then find a sturdy stick or pole, and then try to turn the Iron-Silicon lump into something useful that's affixed to the end, like a really sharp point.
Then STOP SPENDING PP. We don't want to spontaneously black out.
Edit:
ALTERNATIVELY, spontaneously suffer from mental psychosis, where images of horrifying things, such as Avagadro's Number, a genderless self-image, creating weapons from bone and iron, and then being attacked and almost killed by a monstrosity after wandering around in the Boneyard! The mental episode ends with the vision of exploding the attacker's arm into component parts with alchemy.
Armed with this new mysterious knowledge, turn to the door and prepare to
melt some faces.[Oh yeah, I went
there. DOUBLE ENTENDRE, BOOM! TRIPLE ENTENDRE! C-C-COMBO BREAKER!
Nah, I'm kidding, I just thought it would be a neat idea to cross-reference the two different games as they go on. Would be pretty unique, I think.
Anyway, I'm definitely having fun with this.]