Ethereal Step

Taking 2 full actions to fully cast, the Ethereal Step will grant you and up to 4 other willing creatures you touch the ability to step between the ethereal plane and the plane they came from. While in the ethereal plane, creatures with this ability can see vaguely into the plane they were before, in grey shades and only within a distance of 60 ft. 

Such a shift takes an action. When in the ethereal plane, creatures in the plane you were in before cannot see you unless aided by magical means. Stepping between the planes only shows the creature disappearing and reappearing without a sound or any visual effect on either plane.