Go to the house southwest of the cave on the trail to Death Plateau

Acquire the needed items and enter the cave earth eternal gold to the northwest of Bur Thorpe Castle. Speak with Saba about the quest.

Go to the house southwest of the cave on the trail to Death Plateau (the southwest trail, not the main northeast one). Knock on the door and talk to Tenzing. He’ll show you the secret path if you can obtain for him 10 cooked trout, 10 loaves of bread, and a spiked boots.

To get the spiked boots, head back to Bur Thorpe and find Dunstan, the blacksmith. Ask him to make you a spiked boots.

Dunstan will refuse to do so, but after some negotiations about the seriousness of the item Dunstan will agree to make you the boots if you can get Denulth’s permission to make Dunstan’s son an official member of the Imperial Guard.

Head back and talk to Denulth inside his shack. He’ll give you a certificate.

Give the certificate and iron bar to Dunstan and he’ll hand you the spiked boots.

Make your way back to Tenzing’s house. Give Tenzing the items that he requested and he’ll give you the Secret way map.

Give Denulth the Secret way map and Combination to the equipment room for your reward.