The Sphere of Shadow deals with spells to cloak and to hide, but it taps into something less easily defined as well -- a little bit of Spirit, a little bit of Illusion, and even a little bit of Scrying: the Sphere generally considered to be the opposite of this one.
Cantrips
There are varied possible effects, depending upon which senses are suppressed.
Minor Spells
This effect only lasts for about fifteen minutes or so, and can be voluntarily dispelled by the caster at any time. Although this does no physical damage to the victim, healing spells of the Sphere of Life pertaining to healing various senses will work against this temporary enchantment.
It may be "filtered" in the same way as Suppress Sense, creating such effects as "black light", and it may be used to either dim light or other senses, or blot it out entirely. It should be noted that this does not suppress the mere sensation of such things, but it actually stops light and such from travelling outside the area of effect. Therefore, if an area of darkness is created, those inside will be able to see nothing, and anyone outside will see a black roughly spherical area describing the area of effect. If an area of silence is created, those inside cannot hear, and any sounds made won't be heard outside the area of effect.
If "magic sense" is the thing being darkened, what this means is that persons able to sense the presence of active magic will not be able to use that sense while in the area of effect ... and any magical activity inside the sphere (or the magical activity of the sphere itself) won't be sensed by those outside. There are limits to what this spell can suppress. It would take a casting of ritual-level power to try to suppress the sound or flash of an explosion, for instance. It can be cancelled out by light, sound, etc., of magical origin.
Rituals
The ideal situation is to hide an object or creature, making that object or creature in effect invisible to just about any sense. Upon casting of the spell, the caster needs to "fine-tune" the spell to the environment, and it works best if the caster actually has the senses that he or she is trying to hide from. If not, the "invisibility" to those senses will be less than perfect, and won't hold up to scrutiny. Moving of the object, close examination of it or changes to its surroundings may reveal "flaws" in the invisibility. For example, if something pungent is brought near by, after it is taken away, the smell may linger for too long ... or if someone examines the area where the object is hidden, there may be a "fringe" or distortion effect that limns the object. Actually moving the object requires that the mage be present to "fine-tune" the invisibility again, or it will look as if a chunk of the previous location has been moved to the new position.
If used for "personal invisibility", this generally works best if it's used for the caster himself, who can alter the illusion as he moves to a new location or new position. Every moment spent "fine-tuning", however, will trigger the senses of anyone who is able to detect active magic.
The spell can be dispelled by the caster at any time, and since it is linked to the caster's will, the death of the caster will dispel the effect as well. (Alternatively, the caster can "free" this spell, making it linger even if the caster is killed, but the caster will no longer be able to voluntarily dispel it.)
This spell has an extended duration, and is magical in nature, not doing any physical damage to the victim. (This does not prevent damage the victim might do to himself in the meantime, though, due to lack of the given sense: staring blindly at the sun, sticking one's hand into boiling water, etc.) This spell can be dispelled by various means, including healing spells of the Sphere of Life that would normally be used for treating physical loss of the appropriate sense. The difficulty of dispelling such effects is tied to the ability of the spellcaster and the power and time put into the casting of the curse.
This spell can also be used to just conjure up "shadow elementals" for purposes of amusement, without actually assigning them a role. It should be noted that Shadow Elementals are among the weakest (if not the weakest) of elementals, and are fairly easily dispelled.
It should be noted that the "elemental" is not alive, nor is it sapient. However, it may seem to exhibit traces of personality, drawing upon that of the caster.
Back to Magic & Technology: Section 5.5.5.4