Sword Art Online
In the anime series "Sword Art Online" (specifically in season 2 also known as "Sword Art Online II") the sword Gram appears in Alfhiem Online wielded as a two-handed sword named "Demonic Sword Gram." It has the ability "Ethereal Shift" which allows the sword to phase through a weapon or shield that is blocking an attack from the demonic sword, but the ability has a cooldown.