Heirlooms

""Heirlooms, consisting of Busts, Portraits, Deeds, and Crests, are used to upgrade buildings in the Hamlet. The Crimson Court DLC adds Blueprints, which are required by Districts.

In dungeons, Crests stack to 12, Busts and Deeds stack to 6, and Portraits stack to 3.

Preferred Locations
Heirlooms can drop in any location; however, each location tends to drop one type of Heirloom more than others. This means that if you are looking for a specific type of Heirloom, it pays to dive into quests in that location. Also, take note of the end-reward for quests, as a number of Heirlooms will be listed as a guaranteed reward for successful completion."Busts:         Ruins""Portraits:     Warrens""Deeds:         Weald""Crests:       Cove"

Trading
In town, Heirlooms can be exchanged for each other. Comet Shards from The Color of Madness DLC can also be traded away.

Inventory Space
When trading for Busts or Deeds, full stacks of Portraits are more space-efficient than the other two. When trading for Portraits or Crests, all the Heirlooms are equally space-efficient.

Of course, not trading at all and avoiding the trading cost is even more efficient, if you can afford to delay a less critical upgrade.

Upgrading Buildings
Different buildings require different Heirlooms, although all require Crests:

Abbey

Sanitarium

Stage Coach (Experienced Recruits)

Guild

Tavern

Blacksmith

Stage Coach (except Experienced Recruits)

Nomad Wagon

Survivalist

Total Requirements
The maximum amount of Heirlooms needed to upgrade every building is detailed below :