If you kill him you get a Golden Seed (source: I didn't like his attitude)

What does pledging your services do?

Thought of it as a covenant first.

he dropped me golden seed when i killed him, he is just annoying so

He drops a golden seed if you kill him. He talks about how he can't knight you as things are because he doesn't have the proper authority... So, I felt a little cheated. I wanted him to pay with his life. Gold seed is a good payment. ^^

There is literally no reward for this quest. Just like there is essentially nothing rewarded for killing most bosses. Wtf.

You get the Erdsteel Dagger as a reward.

I know the game just came out but does anyone know what he does after he said that he will begin his search for a proper lord? Will he leave the fort after reloading and appear somewhere else? does he give you more quest in the future? is this one quest for a dagger all he good for? personally I would like to know because I finished the first quest, got the dagger and now I'm considering if I should go ahead and kill him for the gold seed.

I talked to him after already clearing his fort and he gave me the dagger on the spot, however, travelling back to the fort I couldn't find him, tried fast forwarding the day but nothing happened.