Seraph takes out the key that he got from Udon and tries it on the door.

The key does not work

"Damn it! Udon! Do you remember anything about this door and how to open it?" 

He says “my friend built this door here after he found the ball, he lets no one in and he keeps the key on him at all times

"We need to find him then and I might have an idea how"

Seraph checks the radar again but this time to see which part of the castle the dragon ball is in. He figures that if Udon's friend is being possessed by it, then where the Dragonball is, the friend is as well. 

The dragon ball is in the farm area

Also today I will be going on a two week camping trip so I will not be able to post for two weeks

Seraph doubles back towards the farm area though he tries to be sneaky about it. Perhaps if he can get the drop on the other possessed leader of this place it would make knocking him out go smoothly. 

Roll for stealth

Stealth: 16

He sticks to the shadows of the castle and sneaks out with ease

So what does Seraph see in the Farm area while hidden?

He sees a group of shackled workers in tattering clothing tilling the fields

Tries to see if there's any leader around them or someone that's making them work nearby. 

There is a robot commanding the workers

 Can we take a Surprise Round to absolutely destroy the robot? Also wasn't Udon's possessed friend supposed be here as well?

He is somewhere in or near the castle but he is not in the fields

Polypore deals enough damage with his first attack to instantly destroy the robot

Seraph would use the Dragon Radar to track down the 2nd Dragonball, and by extension the possessed friend. 

The dragon ball is in the castle’s worker’s quarters