Little explorer (part 2)

I couldn't sleep last night. All the night I've been thinking about the locked door. What is there behind this door? Will I find the key? Where shall I look for the key? I have no clue. Maybe I should ask it to the civilians of Fibula first. Maybe they have some advice, or maybe they now where I can find the key.

And so I did. My first interesting result I found at Dermot:
Fox The Giant: hi
Dermot: Hello, traveller Fox The Giant. How can I help you?
Fox The Giant: fibula dungeon
Dermot: You are at Fibula. This isle is not very dangerous. Just the wolves bother outside the village.
Fox The Giant: key
Dermot: Do you want to buy the dungeon key for 2000 gold?
I thought that's a little bit expensive for the key. And was not sure if it was the right key, so I walked around a lttle bit more, I could still return later (but I didn't).

I talked to some other civilians, but they didn't had any usefull info for me. I went down to the lake to relax a little bit, and then I saw Simon The Beggar. He seemed very lonely, so I decided to talk to him:
Fox The Giant: hello simon
Simon the Beggar: Hello Fox The Giant. I am a poor man. Please help me.
Fox The Giant: how can I help you?
Simon the Beggar: I need gold. Can you spend me 100 gold pieces?
Fox The Giant: yes of course
Simon the Beggar: Thank you very much. Can you spend me 500 more gold pieces? I will give you a nice hint.
Fox The Giant: yes
Simon the Beggar: That's great! I have stolen something from Dermot. You can buy it for 200 gold. Do you want to buy it?
Fox The Giant: yes
Simon the Beggar: Now you own the hot key.
You see a wooden key (Key:3940).
I was wondering if this key would fit the door, but I didn't went down to try it. It was time for dinner, but maybe I'll go down tomorow :D.