I did the same on my first time - it didn’t go so well, lol - I got back to the treasure room, grabbed the gold and started slowly waddling towards the exit - the entire fortress despawned around me and I fell 4-5 storeys. Survived that, but then the fortress started respawning around me (“Waddle Faster! Waddle Faster!”
) amd the outer walls reappeared before I got past them. So then I had a whole fresh fortress to fight my way out of while completely over-encumbered - you can imagine how that went 
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