Step 1
Talk to the Warrior, Lumbridge Swamp.
Chop the Tree.
Go to Entrana.
Go into dungeon.
Kill zombies for an axe.
Turn right at Demons.
Kill Tree Spirit (level-101).
Use knife on branch.
Home Teleport (to Lumbridge).
Enter Zanaris, south-east of adventurers.

Items needed: Woodcutting Axe, Food, Knife, Runes for Bolt Spells.

Go to Lumbridge Swamps and you'll find a small band of Adventurers. Talk to the warrior. Ask him why he is camped out here, then talk to him about Zanaris. Go north-west a little to some trees. You should find a tree with "Chop tree" instead of "Chop down tree."

Now you have to go to Port Sarim and talk to the Monks of Entrana. They will only take you to Entrana if you have no weapons or armour with you, otherwise they will turn you away. Prepare yourself at Draynor Village bank with food and bolt spell runes. You can also bring arrows and fletching materials to the island and make a bow to fight the Tree Spirit with. You can also bring crafting materials to create leather armour.

Once on Entrana, go North-East. Once you cross the bridge go west to the ladder. Go down the ladder. Kill some zombies until you get a woodcutting axe. It doesn't matter what type. Turn right at the Greater Demons, not straight ahead. You will see a great tree in the middle of the room. Attempt to cut it down and a Tree Spirit (Level 101) will appear. You must kill it on your own. It is best to use a bolt spell and try to hide behind the mushrooms to prevent damage. If you don't have runes, you will have to use your woodcutting axe you received from the zombies to kill it.

Once you have killed the Tree Spirit, chop off a branch of the Dramen tree. Use a knife on the branch to get the Dramen staff and use Home teleport to get back to Lumbridge. Go to Lumbridge swamp and back to the adventurers. Walk south-east and you will find a little house, somewhat like a broom closet. Walk in there with your Dramen staff equipped and you will be teleported to Zanaris (The Lost City).