Shrunken head on assassins creed brotherhood

Shrunken Heads are a required item for the Blacksmith shop quest. They can be found one of two ways.

1. Purchase noble treasure maps. These are the biggest and best treasures. They all contain 1500+ florins and a rare item. Noble treasure maps can be purchased from art merchants for between 15,000-20,000f.

2. Kill gangs of thieves. It's a rare drop, but occasionally, highwaymen will drop shrunken heads (and other rare items like elephant ivory, ambergris, etc).