How do you do Dieter's quest on HorseIsle?

Answer 1

I believe you're referring to Dieter's Scavenger Hunt.

Dieter is located in Cantle Meadows on Saddle Isle.

He will tell you a riddle that describes an item that can be found on the ground on Horse Isle. You must figure out what item he is referring to, go find that item on the isle[s], and return it to him. For each item returned, he will give you a small money reward. There are a total of 10 riddles with a total money reward of $22,500 and 300 Quest Points.

Aveline, Bay Server.

Answer 2

Lenny's Brass Valve (50qp) [Intermediate]

Begins: Lenny, resident of Lava Isle

Items Needed:

Lenny needs a brass valve. He will give you a chunk of Zinc Oxide, 10 copper ores, and $3000. Talk to Sandy at the Appleton Rock Shop. Return to Lenny with the brass valve.

Reward: 2 rubies