Imp Catcher
Start:Talk with Wizard Mizgog on the 3rd floor of the Wizard's Tower.
Hints: Go slaughter innocent imps (they look like tiny Delriths) until you find all four beads, they're black, red, white and yellow. Click the '.' at the end of this paragraph for a better look. (Thanks to LRBowers for the pic!) If you go this route and kill them yourself, be warned -- it takes a lot of patience. M
To see a map of where the imps spawn, click the 'M' at the end of this paragraph. (Thanks to Lord Stone!) M
If you can find people who will sell or give you the beads, that will work too. (Verified by Visolela -- black and yellow given to her, red sold to her, collected the white herself.)
Return to the Wizard Mizgog for your reward.
Reward: Amulet of Accuracy (adds +4 to weapon aim when worn), 1 quest point, magic skill (+3[level 5-8, 12-15])