Bás is never far from Saol. Twin revolvers forged together with the ashes of ancestors gone. No revolver shoots straighter or more true than these two. Balance is brought with these weapons. Bás rights Saol, Saol rights Bás.
It’s up to you to decide whether a character has proficiency with a firearm. Characters in most D&D worlds wouldn’t have such proficiency. During their downtime, characters can use the training rules in the Player’s Handbook to acquire proficiency, assuming that they have enough ammunition to keep the weapons working while mastering their use.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Sap. If you hit a creature with this weapon, that creature has Disadvantage on its next attack roll before the start of your next turn.
Notes: Damage: Necrotic, Range, Ammunition (Firearms), Reload, Sap