Group Splendor

       Usage: cast 'group splendor' : cast 155 
      Effect: Int, Wis, Detect Invis, Detect Magic, Sense Traps 
        Cost: 20 per person in group
    Duration: 4 + (level/2) hours
Casting Time: 10
      Target: None

The classes that get the spell group splendor are:

illusionist: Level  70 (excellent)