"This one packs a punch!" ― Rhia
Umbral Horn of War is a treasure from the Into The Wild expansion. Umbral Horn of War is a level 2 treasure, and may be chosen at the beginning of Battles 3 and 4 of an expedition. This treasure provides effects for the whole group, and so only one may be in play at a time.
Details[]
At the start of the game, set this treasure next to a spell supply pile that costs 6 
or more.
This treasure grants the following persistent effects for the entire duration of the game:
- Spells from the chosen supply pile deal 2 additional damage when cast. All damage is dealt to the same target at the same time.
If you cast a chosen spell that deals multiple instances of damage, then each instance deals 2 additional damage.