Difficulty Level: Easy - Medium

Items/Skills Needed To Start: Level 10 crafting, able to beat a level 48 guard. Also need molten glass, a bucket, a bronze bar, and three planks.

Starting Location: Southwest of Ardougne, west of the Gnome Battlefield, northwest of Treegnome Village.

Reward: 2 quest points, some crafting experience (approximately 2,000 - 4,000, depends on your level), Uncut Sapphire, and a unique reward depending on what constellation you see at the end. Click here to see what the possible other rewards are.

Instructions:

1. Go to the observatory (starting location) and talk to the Professor. He says he needs help fixing his telescope because the local goblins have tampered with it. Agree to help him, and he'll say he needs 3 planks for the tripod. It is much easier to have all of the items listed in the requirements (planks, bronze bar, molten glass) before you start the quest. To get the planks, go to the Barbarian outpost east of Ardougne and pick them up at the spawn touching the building.
   
   
2. After returning with the planks, he'll ask for some bronze. The easiest place to get it from here is the Port Khazard (south of Ardougne), which has tin and copper, and then taking them back to Ardougne and using the furnace.
   
   
3. After returning with the bronze, he'll say he needs molten glass for the lens of the telescope. Deposit all of your armor and weapons and go to the Port of Sarim, bring a bucket.
   
   
4. Go to Entrana on the ship and head east, then travel over the bridge. West of the bridge is a seaweed spawn. Pick up one.
   
   
5. Use the seaweed in the range in the building north of the ship to get soda ash. Head outside and use your bucket on the sand to get your bucket full of sand. Use the sand or soda ash with the furnace (also north of the ship) to get molten glass. Go back to the mainland and head to the nearest bank. Withdraw all of your weapons and armor you need to fight a level 48 guard, and one cure poison potion. Travel back to the observatory.
   
   
6. At the observatory, talk to the professor again. He'll say that he can't use the molten glass without getting the Lens Mould. Head down the ladder in the building.
   
   
7. This dungeon is a maze. Level 19 goblins are scattered throughout the entire cavern, but they aren't aggressive. Nearly all of the chests are filled with poison spiders, but the chest directly south-east (very close to the ladder you entered with) has one dose of cure poison potion, but I suggest you bring your own because you might not find it right away and become poisoned. The lens is in a small room inside some sacks, but the gate is locked. You need a key. Travel all the way east, then go all the way south, and once all the way south go as west as you can. You will find a chest. DO NOT open any chest other than the chest I described. There are poison spiders in every one of them. NOTE: The directions for finding things in this cavern are hard to follow because it is a very confusing maze, so use the following map which is much easier to understand:
   
   
   
8. Inside the correct chest there will be a small key (when examined it's called the "prison key"). Travel back all the way east and all the way north, which is the way you came. Head a little west then south, and you will be by the room with the lens in it. If you try to open the door, a level 48 guard will attack you. Kill the guard and use the key with the gate. Search the sacks to find the lens, and exit the room. Head west to find the ladder that leads you out.
   
   
9. Talk to the professor again. He says he's not good enough at crafting to make you the lens, so you have to do it. Use the lens with the molten glass and talk to him again. He thanks you and says to meet him at the telescope (which is on top of a hill right next to the observatory building, but you can't climb up the hill).
   
   
10. Go back down the ladder and into the dungeon. Travel all the way east and then south, and then go west. You will eventually come to a second ladder (not the one you entered the dungeon with). Climb up the ladder.
    
    
11. Talk to the professor. He thanks you again, and asks you to use the telescope. Use the telescope and a window with a constellation will pop up. Close the window, then talk to the professor again. He tells you what it is and rewards you. The quest is complete. To get back to the observatory building, travel back through the dungeon.

Two other items you should be aware of once you have received your reward:

• Click on the Observatory Assistant and he will reward you with a wine
  (once only).
• The pop-up when you click on the book in the Reception Area indicates
  that you have to locate the Spirit of Scorpius (just north of there),
  where you will get the mold to create Unholy Symbols.

Possible Rewards

Along with the guaranteed award, which is mentioned up at the top of this page, depending on what constellation you saw at the end your reward will be unique:

Aries: Attack experience
Capricorn: Strength experience
Virgo: Defense experience
Cancer: Emerald Amulet of Protection
Taurus: Super Strength Potion
Leo: Hits experience
Sagittarius: Maple Longbow
Pisces: 3 Cooked Tunas
Gemini: Black 2-Handed Sword
Scorpio: Weapon Poison
Aquarius: 25 Water Runes
Libra: 3 Law Runes