OOC
Gorgamesh concentrates as he looks around him. With a quiet voice he casts a spell, trying to detect magical auras, excluding his companion’s auras.
Is there another presence here? Another magic user who wish to remind hidden or maybe the area is magical by nature.
(Int+Vim – sense spell)
There are a lot of things you can do with Intellego Vim magic - but each spell can only do one thing. Here are some examples, based on your question,
In ArM, a "magical aura" is a supernatural aura that permeates a place, and is attuned to Magic. There are auras attuned to Faerie (faerie auras), the Infernal, and the Divine, too. I know that's not what you meant, but just in case here is a spell to determine its power - but this one detects an Infernal aura, since I reckon that's the aura we're in...
Gauge the Infernal Power Intellego Vim 3
Range: Touch, Duration: Momentary, Target: Individual
Sense the strength of an Infernal aura the caster is standing in. Similar spells that reveal the strength of Magical, Faerie, or Divine auras exist.
(Base 2, +1 touch)
A person does not have an aura, but InVi effects
can detect magical creatures and wizards. Wizards are detected by counting their highest Art as the level of the spell, and creatures have a stat called Might that also counts as the level of the spell. Again, however, these require two different spells - as detecting creatures is not the same as detecting wizards (which is not the same as detecting spells). Detecting Infernal creatures is also possible, but demons (which are
one type of Infernal creatures) are immune from detection. Detecting Divine creatures should also be possible, but shows great audacity, and detecting Fey creatures is also possible - but again, each requires a seperate spell. So - here are two spells to detect Magical creatures and magi.
Sense the Might of the Elements Intellego Vim 25
Range: Personal, Duration: Momentary, Target: Vision
This spell allows the caster to see any creature of Magic Might as surrounded by a glowing nimbus of light, stronger light indicating a more powerful creature. The spell both detects creatures of Might and allows the caster to gauge their Might.
(B5, +4 Vision)
Sense the Might of Wizard Intellego Vim 25
Range: Personal, Duration: Momentary, Target: Vision
This spell allows the caster to see any wizard as surrounded by a glowing nimbus of light, stronger light indicating a more powerful magus (a stronger highest Art). The spell both detects wizards and allows the caster to gauge their Might.
(B5, +4 Vision)
These are very high-level spells to cast spontaneously. You can detect strong creatures/magi with lower level spells.
Note also that the spell has to penetrate any Magic Resistance the target has in order to detect it, so it isn't enough to just cast the spell - you need to have enough Penetration too. Your penetration is your (casting roll - spell level), or (casting roll/2 - spell level) for a spontaneous spell; roughly. So you can see that even with your impressive +18 bonus to the casting total, you can cast a spontaneous spell of about level 10, or 5 with penetration 5 - that's just not enough to detect anything. To really detect things you need higher Arts, formulaic spells, and to develop your Penetration ability.