His real name is Buad and he is being hunted by assassins after accidentally giving one of their sick members a potion that kills instead of heals. You can learn this from Abanayabar. Buad gives the quest Buad Blood after you have learned of his true identity.
"I shouldn't hide the key in that kettle anymore. Nearly choked on it last time Linda made soup."
As of the latest version of Dragon Knight Saga, the miller's key automatically spawns in the cauldron.
In previous versions the key can be spawned by one of two ways:
- mind read him to learn where he hides his key
- talk to Stan after the quest Band of Brutes to learn where the key is located for free.
You can buy potions from him.
Miller Upton's StorageEdit
Find the teleporter that is called West Shrine alter. Then head due south from that shrine. You should cross a large river. Keep going past it till you find another smaller river. Follower it WEST and you should see a small carriage type thing at the top of the river mouth.