Start: Speak with Drezel in the underground chamber of the Paterdomus Temple.
Skills: 18 Crafting, and the ability to kill level 30 monsters.
Quests: Priest in Peril.
What You Need: Amulet of GhostSpeak (from Father Urhney in the Lumbridge Swamp), a Silver Bar, and a Sickle Mould.
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Getting Started
To begin this quest, find Drezel in the Underground Chamber from the Priest in Peril quest, and ask him if there's anything else you can do. He asks you to find Filliman Tarlock in Mort Myre. Tell him you will find him, and Drezel will give you 3 Meat and 3 Apple pies to bring to Filliman. Now go through the Magic Barrier and enter into Morytania.
Finding Filliman
Once you're in Morytania, cross the bridge and head south until you reach a gate. Open it and dash through the swamp continuing southward. Be careful, once you go through the gate Ghasts will attack you and may cause a piece of food to become rotten. If you don't have food, they will hurt you instead! The swamp may also decay you, causing damage.
When you come to an island, take the west path until you come to a broken bridge. Jump over it (gives 15 Agility xp) and speak with Filliman, trying to make him realize that he is a ghost. Be sure to be wearing your Amulet of GhostSpeak when you talk to him! He refuses to believe you, no matter what you say. Next to him is a table with a Wash Bowl on it, and under the bowl is a Mirror. Pick it up and use it with Filliman, which makes him realize that he is indeed a ghost.
Helping Filliman
Now Filliman needs his Journal, so search the Grotto Tree to find it, and then use it with him. He remembers that he wants to become a Nature Spirit, and he needs you to find 3 things:
Something with faith
Something from nature
Something of the spirit-to-become freely given
Filliman also gives you a Druid Spell to find the nature part. Head back to Drezel and have him bless you. Now go back into the swamp and cast the Bloom spell next to a log to get a piece of Mort Myre Fungi. Bring this back to Filliman who still needs the other 2 parts. Search the stones, taking note of the symbols on them. To prepare the spell:
Put the Fungi on the Nature stone - West
Put the used Druid Spell on the Spirit stone - East
You stand on the Faith stone - South
Speak with Filliman and tell him that you know what the puzzle is. He casts the spell and tells you to go inside the Grotto. He then tells you to get a Silver Sickle for him to bless, as well as a Druid Pouch. Go to Al Kharid and buy a Sickle Mold for 10gp from the Crafting Shop. Craft a Silver Sickle and bring it back to the Nature Spirit. He blesses it the Sickle, tells you how to kill a Ghast, and that you need to kill 3 of them.
Go out into the swamp and cast the Bloom spell from the Sickle next to a log. Pick the Fungi that grows, and fill the pouch with 3 of them. After you have 3 Fungi in the pouch, a level 30 Ghast will appear. Kill 3 of them and then visit the Nature Spirit again. He will cast another spell, and the Grotto will transform into an Altar of Nature. You're finished!
Rewards
A Silver Sickle
3,000 Crafting xp and 2,000 Defense and Hitpoint xp
The Nature Altar, which you can pray at once to charge your Prayer and boost your level by 2 (like the Prayer Guild).
2 Quest Points