
He will ask you if you will to help him by killing the dog. Tell him you will.
Go down the dungeon entrance that is shown on the map to the north. Kill the Temple guardian Dog in the room.
Go back and knock on the door again. He will act very strange. He suggests you talk to King Roald.
King Roald tells you that the dog was guarding the palace from attack, and he tells you to go back and fix it right away.
Go back to the temple and kill a Monk of Zamorak (level 30).
He will drop a Golden key.
Go to the 3rd floor and talk to Drezel through the cell door. Ask him to tell you about the Holy River. He will tell you how Sardomin made the river unpassable to all who were evil. He says that the river may not protect them again and asks you to help make it protect the lands again. He will tell you to get him out of the cell, incapacitate the vampire, and help fix the holy river.
Go back to the dungeon and go through the gate. Study the monuments. When you find a monument with an iron key in it, trade the golden key for it. Use your bucket on the well while you're here to get some murky water.
Go back to the Cell and use the iron key on the cell door, then go in the cell and talk to Drezel.
He will tell you that he can't leave with the vampyre there and that water from the river might seal the tomb. Try to use your bucket of water on the coffin and you'll find out it needs to be blessed. Talk to Drezel again and he will bless it for you.
Use the blessed water on the coffin, and talk to Drezel again. He will tell you that he will meet you down by the monument.
Go back to the monuments and go through the north-east gate. You will find Drezel there. Talk to him. He will tell you that the river has been unblessed. You suggest using rune essence to remove the Zamoraken magic. He tells you it will take 50 rune or pure essence to do it.
You have now completed the quest, talk to the priest again and he will tell you about the underworld beyond the rift which will take you to a new land.
Note: The dog cannot be killed using Magic combat spells.
Here is a picture of the Dungeon:


Note: You MUST bring un-noted essence or he will not accept it.




Source: www.runehq.com
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