The Monstrous Arcanum is an ancient book available to Norsca and Wintertooth in campaign, which contains unique monster hunt missions.
These quests are unlocked via the Norscan technology tree, and have various powerful rewards such as unique items, banners and Regiments of Renown. All Monster Hunts give the player 10000 money as a reward.
The technologies required to unlock Monster Hunts are:
- Monster Hunter: Unlocks level 1
- One With Beasts: Unlocks level 2
- Master of Beasts: Unlocks level 3
In May 2018, four new monster hunts were added as part of the Resurgent Update for Total War: Warhammer II. These are not available in the first game.