Know Greatest Enemy

Magic of Faerûn (Mag)Updated Forgotten Realms (3.0)

Know Greatest Enemy is a D&D 3.5 spell (Divination) from Mag. On class lists for Blackguard (Level 3), Paladin (Level 3), Paladin Variant (Level 3), and others. Range or area: Close (25 ft. + 5 ft./2 levels); Saving throw: None (see text); Duration: Concentration, up to 1 round/level; Casting time: 1 standard action.

School
Divination
Casting Time
1 standard action
Components
V, DF
Range
Close (25 ft. + 5 ft./2 levels)
Area
Quarter circle emanating from the caster to the extreme of the range
Duration
Concentration, up to 1 round/level
Saving Throw
None (see text)
Spell Resistance
Yes

This spell evaluates the creatures in the area and determines the relative power level of each.
Creatures are evaluated as follows:
Among creatures within the same category, you know which is the most powerful, but not why.
For example, among a group of ogres (CR 2), you would know one of them (an ogre with 2 levels of barbarian, CR 4) was the most powerful, but not know if it was because the ogre had class levels, because of a template (such as half-fiendish), or for other reasons.
Any spell of 3rd level or higher that prevents scrying attempts on a creature (such as nondetection) or area (such as false vision) thwarts this spell’s ability to evaluate that creature or creatures within that area.