Once on each of your turns when you hit a creature with an attack using a weapon or Unarmed Strike, you can imbalance its humors using one of the following options. Once you use this feature, you can't use it again until you finish a Short or Long Rest unless you expend one Battle Die (no action required) to restore your use of it.
Choleric
Until the start of your next turn, the target has Advantage on attack rolls and attack rolls against it also have Advantage.
Melancholic
The target has Disadvantage on the next D20 Test it makes before the start of your next turn.
Phlegmatic
The target can't make Opportunity Attacks until the start of its turn.
Sanguine
The next time the target takes damage before the start of your next turn, it takes extra Necrotic damage equal to one roll of your Battle Die without expending it.