Scorpion Catcher

Beginning
To begin, talk to Thormac on the top floor of his tower. He'll tell you that his rare Kharidian scorpions have escaped and are currently running loose. He'll give you a cage to catch the scorpions in and suggest you go talk to the Seers that live just to the north.

The First Scorpion
The Seer will tell you about a secret room with nasty spiders nearby. It would be a good idea to pick up an anti-poison potion, anti-dragonfire shield, and dusty key if you have one. Then, make your way to the Taverly Dungeon. You need to go in just past the Black Demons where the Poison spiders are. It should be fairly easy to spot a small room nearby with a false wall you can push. Use the scorpion cage on the small scorpion inside this room to catch it.

The Second Scorpion
Return to the Seer to find the location of the second Scorpion. It will be in the Barbarian Outpost north of Ardougne. To get in, you'll have to have done or do the Bar Crawl miniquest. Once inside, it's a simple matter to find and catch the scorpion.

The Third Scorpion
Once you talk to the Seer again, he'll tell you where to find the third and final scorpion. It's in the Monastery on the second floor. You'll have to have 31 Prayer to get inside. Then just use your cage on the scorpion to catch it. Take the full cage back to Thormac and you're done!

Rewards

 * 1 Quest Point
 * 6,625 Strength experience
 * Ability have Thormac make a Battlestaff into a Mystic Battlestaff for 40,000 gp.