You know the location and power of all magical auras within your sight. An aura's power depends on a spell's functioning
level or an item's
caster level, as noted in the description of the
detect magic spell. If the items or creatures bearing the auras are in line of sight, you can make
Spellcraft skill checks to determine the school of magic involved in each. (Make one check per aura; DC 15 +
spell level, or 15 + one-half
caster level for a nonspell effect.)
If you concentrate on a specific creature within 120 feet of you as a
standard action, you can determine whether it has any spellcasting or spell-like abilities, whether these are arcane or divine (spell-like abilities register as arcane), and the strength of the most powerful spell or spell-like ability the creature currently has available for use.