Strangely, life magic users seem to be unable to detect Raise Power after it is cast:

Empath:

>> power
You reach out with your senses and see flickering streams (8/21) of vibrant blue and white Life mana flowing through the area.
Roundtime: 7 sec.

>> power area
You can't sense anything about the immediate area.
Roundtime: 6 sec.

Moon Mage:
>> power
The influence of the three moons is in balance.
Moonlight Manipulation and Psychic Projection spells are favored.
You sense the Raise Power spell in the area, which will last for about six roisaen.
Roundtime: 3 sec.

>>power area
You sense the Raise Power spell in the area, which will last for about five roisaen.
Roundtime: 3 sec.

Necromancer:
You reach out with your senses and see pulsating streams (10/21) of black Necromantic mana oozing through the area.
You sense the Raise Power spell in the area, which will last for about six roisaen.
Roundtime: 3 sec.

R>power area
You sense the Raise Power spell in the area, which will last for about six roisaen.
Roundtime: 6 sec.

Ranger:


>> power area
You can't sense anything about the immediate area.
Roundtime: 8 sec.

Hmmm. That may be it then. I was comparing a 140ish MM and 70ish necro to a 30th circle empath.