Making History

Walkthrough
In order to save the outpost from King Lathas, you'll need to talk to Erin the silver merchant, Drolak the ghost, and Dron the warrior. You can do this in any order.

Erin the silver merchant -

Go to East Ardougne and talk to Erin at the market. He will give you a key. You need to use it to find a buried chest. The closer you are to the chest, the warmer the key. There are six temperatures: Freezing, very cold, warm, very hot, burning hot, and steaming hot. When the key is steaming hot, you're right on the spot and you need to dig to get the chest! The key will also tell you if it's become a bit hotter or a bit colder since the last time you used it.

It should lead you to an area near the observatory. Dig and open the chest to get a journal. Read it to learn about a Zamorakian that used to live in the outpost who played pranks on the people of Ardougne. Talk to Erin again.