2161003 promised to stay behind to help others even after his brother was rescued. In order to defeat 8210007, you must have the 4032834 that 2161003 carries.
Hm? You want the 4032834? There's an extremely powerful monster in the Third Tower, 8210007. But, I'm sure you don't mind. You wouldn't want to go if you couldn't handle it!
I was in the Third Tower too, looking for my brother, so I know what kind of key to make. I'll need materials, of course. Whoever made these locks was big on variety, I guess. You can get the stuff I need from Bearwolves. Okay?
Accept
Wow. You are just... Wow. Not that I'm, y'know, jealous or anything. I'm pretty useful, too...like when you need keys. Like now! If you clear out the 8210003 infestation and bring me 200 4000627, I'll show you what I can do. Again.
Decline
Are Bearwolves too much for you to handle? I could try to steal from them with my Play Dead technique... Actually, that sounds too dangerous.
Required items
Bearwolf's Morning Star
(200)
Resulting items
Bearwolf's Morning Star
(-200)
Key to the Third Tower
(1)
Main dialogue
All right, you brought the 4000627s! Very impressive. Give me a moment, and I'll make your key.
Accept
Here is the 4032834 you've been waiting for. I hope you can defeat 8210007! That thing is horrible! Oh, and come back to see me if you happen to lose the key. I can always make more...with the right materials.