Level: Beguiler 7, Sorcerer 7, Wizard 7
Components: V, S
Casting Time: 1 standard action
Range: Personal
Target: You
This more powerful version of arcane sight makes your eyes glow blue and allows you to see magical auras within 120 feet of you. The effect is similar to that of a detect magic spell, but greater arcane sight does not require concentration and discerns aura location and power more quickly: you automatically know which spells or magical effects are active upon any individual or object you see.
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. In some cases, arcane sight may give a deceptively low reading—for example, when you use it on a spellcaster who has used up most of his or her daily spell allotment.
Greater arcane sight doesn’t let you identify magic items.
Unlike arcane sight, this spell cannot be made permanent with a permanency spell.
Source: Player’s Handbook (version 3.5), page 201.