There are 2 uses for this skill
1 reveal hidden players
2 reveal traps
On Demise it will only reveal hidden players
You can macro this skill forever and never detect a trap. You need this skill (which does nothing in regards to traps) so you can remove traps
On OSI If you are successful when you use this skill on a container this happens
The colour of the word trapped denotes the type of trap
Purple
for explosion traps
Blue for
dart traps or dart & explosion traps
Green
for poison traps, poison and dart traps, poison and explosion traps or poison and dart and explosion traps