Scorpion Catcher

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

The First Scorpion
''WARNING: Unlike the other two scorpions, you will NOT be able to access this one unless you have already spoken to the Seer. If you skip this, when you search the wall you will receive a message and be unable to access the room. The other two may be found without returning to the Seer in between.''

The Seer located in Seers Village 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 Taverley Dungeon any way you want (games necklace to games room, combat bracelet to warrior's guild, house teleport with house in taverly or Falador teleport and walk to Taverly). If you have 70 agility use the shotcut to the blue dragons, otherwise walk around and use the dusty key on the gate to blue dragons. Then go south of the dragons and west to the Black Demons, then north to 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 (if you try to pick it up it will sting you for 3 damage).

The Second Scorpion
Return to the Seer to find the location of the second Scorpion. He will hint to a merchant in Barbarian Village, but don't bother going there unless you want a funny dialogue, it's actually in the Barbarian Outpost (use a games necklace to teleport there). 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 (either use combat bracelet to teleport directly there or use glory amulet to teleport to edgeville and walk west). 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 coins.

Trivia

 * The Seer's hint for the second scorpion seems to point at Barbarian Village (...a little village in the east, surrounded by lots of uncivilised-looking warriors.), but it's actually at the Barbarian Outpost to the west.