Go to the Head Guthix Architect and he lets you know this is only one of those three idols they have found, also he says they all look like the symbols of RuneScape gold their gods. After extensive talking and a split-screen of the start of the war involving Saradomin and Zammorak, the Guthix Architect tells you to conserve the idols (in other words fix them). To correct the Saradomin Idol (will become Saradomin sword throughout the god war if you chose sara as your god) you need to utilize 5 mithril bars, two golden bars and 10 sapphires on the idol, and then you enchant it with lvl 3 enchant.
To fix the Guthix Idol (will turn into the Guthix Flail through the god war in the event that you chosen guth as your god) you need to use 4 gold bars, 10 emeralds, and 5 diamonds on the idol and enchant with lvl 3. After you've repaired and enchanted all of the idols return to the Guthix Architect. He'll inform you more about the war 200 years ago and you will see another split-screen of this god war. When you have completed it is time for your traveling, combating, and hardness of the quest. The Architect will tell you the way to fully enchant the idols you will have to travel around runescape Looking for special ingriedients to get an"enchantment mix" (which you will have to create )
Obviously since it's to do with herblore you have to go to the master druid sanfew. Once you talk into sanfew he will inform you the ingriedients necessary for the mixture (random every time, but always entails a Saradomin Wizard appearing and dropping the most important ingriedient) So that you hunt half-way round Runescape searching for 10 items needed for the mix. When you find all them just use them together with the vial, you may recieve"enchantment mixture(3) (just how convienient) Then you return to the Head Guthix Architect and he explains how to use the mixture. (you've got one chance on this choose the Ideal god)
Use the mix on all three things then use your finished book on all three (don't worry you will not loose it: it just permentley enchants the idol) and you see a somewhat disturbing split-screen....OF YOU 200 YEARS AGO AS THE LEADER OF THE GOD YOU HAVE CHOSEN TO FOLLOW. Then comes the fun part, You visit the center of The Lost Land of Guthix and use a saw on the ground, right next to the statue of Guthix. You will fall down a pit with a passageway. Pick 125 nails, 5 limestone bricks, 8 steel bars, and 4 cloths
Go to the east into buy OSRS gold the beat-up, near destroyed chapel. It's time to repair it. There'll be a wall now that is appropriate for a Guthix shrine. Next use the 5 boards on the muddy floor, you will find a wooden floor. Then use the oak planks for the change you need five because it's a special change. Use the steel bars to the change and that will turn out to make steel candles round the alter. Finally use the cloths on the pine floor to make a pathway.