Blink

Physical attacks against you have a 50% miss chance and the Blind Fight feat doesn't help opponents, since you're ethereal and not merely invisible. If the attack is capable of striking ethereal creatures, the miss chance is only 20% (for concealment). Any individually targeted spell has a 50% chance to fail against you while you're blinking unless your attacker can target invisible, ethereal creatures. If the attacker can see invisible creatures, the miss chance is also only 20%. For an attacker who can both see and strike ethereal creatures, there is no miss chance. Likewise, your own attacks have a 20% miss chance. While blinking, you take only half damage from area attacks (but full damage from those that extend onto the Ethereal Plane). Although you are only partially visible, you are not considered invisible and targets retain their Dexterity bonus to AC against your attacks. You do receive a +2 bonus on attack rolls made against enemies that cannot see invisible creatures.