Sap

Weapon mastery property. Requires a feature that unlocks this weapon’s mastery; weapon proficiency alone is not enough.

Trigger and effect

When you hit a creature with a Sap weapon, it has Disadvantage on its next attack roll before the start of your next turn.

Damage is not required by this property. The effect applies to the next attack roll, not to every attack for an entire round, and not to ability checks or saving throws.

Timing and overlapping effects

The benefit expires if the creature does not make an attack roll before your next turn starts. Once it makes that next attack roll, the relevant attack has used the effect.

Repeated applications do not create extra disadvantage dice or a queue of attacks with Disadvantage. Use the ordinary Advantage and Disadvantage rules, including cancellation if Advantage also applies.

Example weapons: Mace and Longsword.

Workshop tracking

The workshop shows supported mastery information for selected, proficient weapons. Resolve targets, rolls, movement, timing and effects at the table.

All weapon masteries · weapon proficiency · basic actions.

Source: supplied Player’s Handbook (2024), chapter 6, Mastery Properties (PDF page 213; printed page 214). Paraphrased quick reference; specific rules can override these general rules.