Step 1
Talk to the Warrior, Lumbridge Swamp.
Chop the Tree.
Go to Entrana.
Go into dungeon.
Kill zombies for a hatchet.
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: Food, Knife, Hatchet, 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." After chopping the tree with any hatchet, a leprechaun named Shamus will pop up and when you talk to him, will tell you about a special tree in a cave found in Entrana.

Now you have to go to Port Sarim and talk to the Monks of Entrana, on the way to Port Sarim use the bank in Draynor Village. Bank your hatchet you used to make the leprechaun appear and any other weapons or armour you have on you. Prepare yourself at Draynor Village bank. Get 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 you are prepared continue you on to Port Sarim and talk to the Monks of Entrana

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 hatchet. 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 (or any higher magic spell) and keep a close watch on your health. You can use a safespot that's south of the Dramen tree, near a torch. There should be an enclosing there. If you don't have runes, you can range it if you brought supplies to create a bow, arrows, and armour. Otherwise, you will have to use the woodcutting hatchet 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).