If a weapon with the Raking property is used to make an attack, the attacker can specify two adjacent targets within 5 feet of them, the targets may not be further than 15 feet away from each other. Targeted creatures must make a Dexterity Saving Throw against a DC which equals to 10+your dexterity or strength modifier(whichever was used to make the attack). If the creature fails they take damage according to the weapons description and you do not add any modifiers to the damage, and if they succeed they take no damage.