Unless stated otherwise, a ranged attacker must have line of sight to their intended target to make an attack roll. If a partial obstruction lies between the attacker and target, the target has cover. Attacks made through cover are rolled with disadvantage. If the obstruction is total, there is no line of sight.
Line Of Sight & Cover
Unless stated otherwise, a ranged attacker must have line of sight to their intended target to make an attack roll. If a partial obstruction lies between the attacker and target, the target has cover. Attacks made through cover are rolle...