Curse of Zaros.

I found this on sals realm
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Start: Speak to the Mysterious Ghost outside of Glarial's Tomb.
Requirements: You must have the Ring of Visibility from the Desert Treasure Quest, and have the Ghostspeak Amulet from the Restless Ghost Quest.
Notes: You can get a Ring of Visibility from Rasool, and a Ghostspeak Amulet from Father Urhney.


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Getting Started

Make sure you are wearing your Ring of Visibility and your Amulet of Ghostspeak. You can't see the ghosts without the ring, and even if it is on, they do not appear on minimap.

Outside of Glarial's Tomb north of Ardougne, you will find a Mysterious Ghost. He is cursed, and will talk about Armadyl's Staff. After he has told you his story, you will receive a Ghostly Robe Top. He will ask you to find another ghost, the thief Rennard.


From now on, each ghost that you must talk to are in order, and the location of the ghosts is different for everyone. If you speak to the correct ghost at the wrong location (you are given a location), it will not work.

Rennard

Rennard the Thief can be found in several locations, including:

The Crashed Pirate Ship in Level 56 Wilderness.
Bandit Camp in the Wilderness.
Bandit Camp Bar in the Desert.


Once you find him and speak to him, he will give you a pair of Ghostly Gloves. Then he will ask you to find Kharrim the Messenger.

Kharrim

Kharrim the Messenger can be found in any of the following locations:

The Wilderness Graveyard (not the Cemetery).
Prayer Altar in Level 44 Wilderness.
End of the Lava Maze near the Lesser Demons.
After speaking to him, he will give you a pair of Ghostly Boots and ask you to find Lenissa the Spy.

Lenissa

Lenissa the Spy can be found at the following places:

In Port Sarim, near the boat from the Dragon Slayer Quest.
Inside the Seer's Party Hall.
The first floor of the Wizard's Tower, near the Bookshelf.
Inside the Entrana church building.
Near the Gnomeball Court


After speaking to her and listening to her story, you'll receive the Ghostly Robe Bottom. She will ask you to speak to her superior named Dhalak the Mage.

Dhalak

Dhalak the Mage can be found:

Upstairs in the Prayer Guild, near the Altar.
Inside the Seer's Party Hall.
First Floor of the Wizard's Tower near the Bookshelf.


He will give you a Ghostly Hood and ask you to look for Viggora the Warrior.

Viggora

Viggora the Warrior can be found at the following locations:

Paddewa, Edgeville Dungeon, near the Earth Warriors.
Second floor of the Rogue's Castle in the deep Wilderness.
Second floor of the Canifis Slayer Tower, just before the Infernal Mages.


After hearing his story, you'll receive a Ghostly Cloak from him! Congratulations, you've found all of the Ghost Robe pieces!