At certain times, a creature, NPC, or PC may engage in a Battle of Wills. To do so, each opponent can choose to spend up to 12 Sanity (if they have them) to force the other to falter and submit. The number spent will be represented by either 2d6 or 1d12, and revealed at the same time to each opponent. The margin by which a victory is claimed will have varying degrees of consequence for the losing party.

To gain the upper hand, an opponent can make Deception vs Insight to either tell how powerful their opponent is, or trick the other into thinking that they are weaker or stronger, thus trying to influence how many Sanity points to spend.