Question: If a creature is in the etheral plane and can lower the hit chance from 50% to 20% If you can detect It. Would the effect apply or you need to see it?
Spell in question is Bink
Spirit Sensing Stance: By sensing the different patterns all beings that exist have, the senses of the Veiled Moon disciple exceed that of natural beings and move into the realm of supernatural awareness. While in this stance, the initiators gains the scent special ability and he may detect creatures on the Ethereal plane that are near the Material plane within 30-ft. of his position.
See Invisibility: You can see any objects or beings that are invisible within your range of vision, as well as any that are ethereal, as if they were normally visible. Such creatures are visible to you as translucent shapes, allowing you easily to discern the difference between visible, invisible, and ethereal creatures.
The spell does not reveal the method used to obtain invisibility. It does not reveal illusions or enable you to see through opaque objects. It does not reveal creatures who are simply hiding, concealed, or otherwise hard to see.
See invisibility can be made permanent with a permanency spell.
Blink: You “blink” quickly back and forth between the Material Plane and the Ethereal Plane and look as though you’re winking in and out of reality at random. Blink has several effects, as follows.
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).
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, since you sometimes go ethereal just as you are about to strike.