The lupin does not automatically know where the invisible creature is, just that it is nearby. Locating it requires other clues. A lupin can also use this ability to detect the presence of ethereal creatures, such as ghosts, phase spiders, or someone wearing plate mail of etherealness . The lupin recognises the difference between ethereal and invisible creatures, but it gains no special attack or defence capabilities against ethereal beings. A lupin character who spends slots to take the tracking proficiency gains the ability at full Wisdom rating, like rangers of other races.
Lupins can also recognise the smell of a person or creature they have encountered before.
Recognition of a particular race is automatic, but the lupin must make a successful Intelligence check to recognise a particular individual by smell. Lupins are repelled by wolfsbane. Wolfsbane ingested by a lupin acts as Type J poison. Fortunately, the keen senses of a lupin nearly always alert it in time to avoid ingesting the substance. If wolfsbane is somehow injected into a lupin's bloodstream, it acts as Type P poison.