Limited Wish Adventure

The Limited Wish Adventure, also referred to as Help Vittorio collect his debt, or Recover Dennis's mother's gong at different quest stages, is a side quest granted by the Limited Wish spell.

Prerequisite
This quest can be done whenever you feel like it, in either chapters 2, 3 or 6, but you must have the Mercenaries of Riatavin in Delosar's Inn in Bridge District still alive, then with a wisdom of 10+, cast Limited Wish, ask for a one-time wish and choose the adventure like none you've never experienced before.

Walkthough
Head out to the Bridge District and just outside the Delosar's Inn you will meet with a man named Vittorio who asks for your help in collecting money off of Captain Dennis. Agree to help him and follow him inside (x 1830 y 2880).

Captain Dennis and Vittorio are having a shouting match when you enter, seems that Vittorio stole and sold Dennis' mother's gong in order to buy ale. That sounds bad. Agree to help find the gong and onto Roger the Fence who you will find in the southern part of the sewers (x 1680 y 2300) beneath the Temple District.

Roger doesn't have the gong, and will only tell you where it is until you take care of a local Sea Troll (x 400 y 2366), which you may have already dealt with. Talk to Roger again after the deed and Druid Grove will be marked on your map.

Once there, head left to find the Troll Mound (x 1330 y 2210). Grae, the troll shaman just outside of the mound will attack you at the mention of the gong, when it gets close to death it offers the gong's whereabouts in exchange for its life (though you can always kill it anyway), the gong is in procession of an Ogre Mage in a tower to the northeast of here.

Wander north, then east, across the bridge to find a big house, just south of it is the tower (x 4840 y 1270). Enter the tower. This Ogre Mage inside is quite the peaceable sort and is very willing to trade the gong for a Wand of Frost, if you have it (12,250 exp). Oh and don't mind the smell because here you will also find Belm.

Return to the Bridge District and give the gong back, everyone is happy and you get your reward:
 * 1500 gold
 * Boomerang Dagger +2
 * 16,500 experience for each party member

Sources & references

 * Baldur's Gate II Walkthrough by Dan Simpson