Difficulty level: Hard
Start location: Watchtower on the NorthWest corner of the wall surrounding Yanille. On the North side of the tower, find the "climb trellis" spot to climb up to the second floor. Then go up the ladder and talk with the Wizard on the third floor.
Required:
Skills: 14 Herblore, 14 Magic, 15 Thieving, 25 Agility, 40 Mining, be able to kill level 58 monsters.
Items: 1 Dragon Bone, 1 Bat bone, 1 Death Rune, 2 Ropes, a Gold bar, Pickaxe, 20 gp, Guam leaf, Vial of water, Jangerberries, Pestle & mortar. Anti-Dragonfire shield is also useful.
Monsters: Ogre (level 4

, Gorad (level 6

, Ogre trader (level 60), Ogre Guard (level 74), Ogre Chieftain (level 70), Enclave guard (level 74), Greater Demons (level 92), Blue Dragons (level 111), Ogre Shamans (level 113)
NPC: Wizard (main npc, quest start, Watchtower north-west of Yanille), Og (west of Yanille, settlement), Grew (west of Yanille, island), Toban (south of Yanille, island), Scavids (Caves in the Ogre area)
Use this map to help you around the quest area to find the NPCs you want:
1: Getting started
Head west of Yanille's city gates until you reach a 3-storied building. Look for the "climb trellis" option on the northern side of the tower, climb up and proceed to the top floor. Talk to the Wizard, and he will ask you to search the grounds. Exit the watchtower, and search all the bushes around the tower until you find the following items:
An eye-patch.
Some fingernails.
A dagger.
Some pieces of Armour.
Go back up to the Wizard, this time you may use the ladder since you have started the quest. He will tell you to communicate with the local settlements and learn the cross paths of the Ogre city. Take the lit candle from the ground floor of the tower; you'll need this later.
2: Og and Grew
Og is the first Ogre you must talk to. Head west of Yanille and you should find him. Speak with Og and he'll say that he will help you if you return his gold bar that was stolen by Toban. Og will give you a key for the chest where Toban has hidden the stolen gold bar. South of Og's settlement you will see a small island. Use the rope on the branch of the tree to the west of the island. You will swing across. Talk with Grew and he will ask for a tooth of his arch enemy; Gorad. While you're there, you might as well pick up some Jangerberries if you haven't already.
3: First part of the Ogre statue
Toban and Gorad are located on a small island south of Yanille. You won't be able to access the bridge leading to the island since it's out. Find the south-west cave entrance which will lead you onto the island (see the green dot on the map (lower left corner)). Kill Gorad (level 6

and get his tooth. Now talk with Toban who will ask you for dragon bones. Give it to him and you'll get your first part of an Ogre Statue. Now you may go open Toban's chest to retrieve Og's gold bar.
4: Second part of the Ogre statue
Head back to Grew and talk with him to return the tooth you got from Gorad. As a reward he will give you your second part of the Ogre statue. Now return to Og and hand over his gold bar and he will give you your third and final piece of the Ogre statue. You should now also have one of the Crystals as well. Head back to the Wizard and use a piece of your Ogre Statue on him, and he'll put it together.
5: Into Gu'tanoth
Follow the road south of Yanille which will lead to the Ogre city. Take the western path, and you should reach some Ogre Guards. Use the statue on one of them, and they'll let you enter their hidden and beloved Gu'tanoth. When you enter the market area, head southwest to find the rock cake stall. Right click and steal a rock cake from the stall. Don't eat it, you'll lose hp. On your way out follow the south pathway until you come across 2 Ogre Guards. Attempting to cross will result in a guard stopping you. As a fair trade to cross the bridge you must hand over a rock cake.
6: The skavid caves
You will approach a rock at the end of the bridge. Before jumping you will be stopped to pay 20gp to a guard. Cross the bridge and talk with any of the guards to hear a Mystery riddle. Use a death rune (the answer to the riddle) on any of the guards to get a skavid map. Exit the Ogre city. And visit the caves marked on the map with red dots. Make sure when entering each cave that you have both the lit candle and the map in your inventory. Enter each cave and speak with the Skavids inside by clicking on the correct option. By speaking with each Skavid you will develop and learn their language. You will have to speak to the Scared Skavids before you can speak to the others.
Now follow the path that leads southeast (the opposite of the path that leads to the Ogre city). Upon your arrival you will see 2 Ogre guards. Talk to one of the two guards, and in the end they will ask for a gold bar. Use your gold bar on any of the 2 Ogres to get through the gate. Follow the road, cross the bridge and then enter the cave there. Talk to the mad Skavid inside, and give him the correct answers and you will be granted the second crystal. Before you exit the cave take a couple of cave nightshades, as you will need these later on (don't eat them!).
7: The Ogre Enclave
It might be a good idea to visit the bank to get an anti-dragonfire shield, and some food at this point (pickaxe as well).
Go to the market area again, and you should see a couple of guards guarding the entrance to an enclave in the west. Use one of your nightshades on one of the guards and enter the enclave. In the cave you will see Ogre Chieftains (level 74), Greater Demons (level 92), Blue Dragons (level 111), and finally Ogre Shamans (level 113). Go north through the cave and exit, head back to the watchtower, and speak with the Wizard to learn about a special potion that will wipe out all the Ogre Shamans.
You will need the following items - jangerberries, guam leaf, bat bones, pestle & mortar and a vial of water. Please make sure you mix the potion correctly, or it'll explode. First mix the Guam leaf with the vial of water, then add the jangerberries to the vial. Take your bat bones and use them with your pestle & mortar. This will grind the bones, add it as the last ingredient. Once completed the potion must be enchanted by the Wizard. Head back to the market place and use a second nightshade on the guards and enter.
When you're in the cave use the enchanted potion on all the Ogre shamans, and they will all die. After killing the last Ogre shaman he should drop the third crystal. In the middle of the cave you should see a bridge with a huge boulder located at the end. Mine the boulder with your pickaxe to get the fourth and final crystal. Head back to the Wizard and follow his instructions to complete the quest.
Reward:
5000 gp
12k - 16k magic exp
Ability to use the Watchtower Teleport (Magic level 5
Quest points gained on completion: 4
Written By/Credits: The Pure12 & Ks Jeppe
Guide from
http://www.tip.it/runescape