Start by talking to the Warrior in the Adventurers' Camp. Say the following things:
- Do you know any good adventures I can go on?
- I don't think you've found a good adventure at all!
- What makes you think it's out here?
- If it's hidden, how are you planning to find it?
- Looks like you don't know either.
Shamus the Leprechaun is hidden in the tree nearest the camp in the west direction. It is the only tree with the "Chop" option, instead of "Chop down". He'll tell you that you need a Dramen staff, then enter the shed in the swamp. To get a Dramen staff, you need to get the wood from the Dramen tree found in Entrana's dungeon.
Shamus will offer to teleport you to Port Sarim, north of the monks. You can't bring weapons or armour on the island. The following are some of the few things you can bring on the island:
- Wizards Hat
- Priest Robes
- Logs, knife, bowstring (to make bow)
- Any type of tanned leather, needle, thread (to make armour)
- Most rings
- God books
Once on Entrana, head to the north-west side of the island, and go into the dungeon. Upon entering, your prayer will drain to 1. To cut the tree, you will need an axe. You must kill the zombies in the dungeon until you get one.
Boss & Finishing Up
Head into the room with the Dramen tree. As you try to cut it, a level 101 Tree Spirit will appear and attack you. It only uses melee, and there is a safe spot on the west side of the room where you can easily mage or range it.
The spirit is especially weak to Fire magic attacks, even Fire Strike works really well. After the spirit is dead, you are free to cut the tree. It is recommended to cut more than one, in case you lose one later on and have a spare.
All that's left to do is use a knife on the Dramen branch, and enter the shack in the swamp.