The Vaults of Zarn is the first campaign expansion to Torch & Shield. It is a narrative focused supplement that introduces expanded rules for Torch & Shield split into four sections.
 
The book is over 220 pages, and adds a large amount of content to the game.
 
Grand Campaigns 

Rules for playing expansive and epic campaigns of Torch & Shield. Explore the different areas of a dangerous and hostile underworld while you search for clues as to where the Zarn Dwarves have concealed their treasure.
As you locate new areas, you unlock new scenarios.
Grand Campaigns adds Trading Post events, Hold exploration and alternate victory conditions.
Grand Campaigns in Torch & Shield create a narrative experience unlike any other game.

Mag Zarn 

New monsters.
New Event and Search Tables.
New competitive and Co-op Scenarios
Legendary Treasures .
Quest Rules to add unlimited adventure to your campaigns.
A load of new scenarios. 

Liars and Thieves 
Rules for four new playable crews:

Ostari Treasure Hunters
Elves of the Abyssal Wood
Kraghelm Clan Dwarves
Outcasts

Delving Deep 
You can now play as the monster crews! Introducing two new types to the game:
 

The vicious and terrifying Krell
The ancient undead Cursed Clans.

This section also includes expanded rules for solo/coop games and campaigns.
 
The book also includes an expanded armoury and new HIrelings/Warriors of Renown.