Imp Catcher

Getting started
Make your way to the Wizards' Tower, south of Draynor Village over a stone bridge. Once there, you will know you are at the right place if you see level 9 Wizards. Climb the stairs, and go up to the. Talk to Wizard Mizgog and ask him questions to find out he needs your help. He will tell you Grayzag's imps stole his beads and wants you to get them for him. He needs you to get:
 * A black bead
 * A yellow bead
 * A red bead
 * A white bead

To obtain the beads, you can buy them from the Grand Exchange, get them from another player, or if you want to, you can kill Imps. Imps can be found almost anywhere. The best place, however, is on the island of Karamja. There are many imps there, but they are guarded by level 14 Scorpions, so if you're lower than level 29, look for imps around the Falador entrances and the outskirts of Lumbridge. Keep killing imps until you have all four beads on you. The imps will sometimes teleport, making them annoying and hard to kill.

A large number of imps can also be located in between the Ardougne Monastery and Tower of Life south of Ardougne.

Another place to find and kill imps is the south entrance to Falador. Besides having around 3 imp respawns, it's a multi-combat zone, so you may enlist a friend to help you weaken the imps.

Note that magic beads can be traded between players, and sold to stores. Many players will often pay high prices for beads to avoid the hassle of finding the beads themselves.

Once you have all four beads, return to Wizard Mizgog and give them to him to finish the quest.

Rewards

 * 1 Quest point
 * 875 Magic experience
 * An Amulet of accuracy