Here are a few spells I pulled from RQII and an old Dragon magazine that worked rather well in my last RQ campaign. The first is a spirit magic spell while the last two are sorcery spells; all three are stated in RQIII terms.
Hope they're of some interest.
DETECTION BLANK Touch, Passive, Temporal
This is a specialized antimagic spell designed to block detection spells. It may be cast to screen any one object, spell, or person from detection. It stops only Sense, Detect, or Find spells, but unlike Countermagic, Shield, or similar spells, it does not let the person doing the detection know that his spell has been blocked. Otherwise, it functions as one point of Countermagic for each level of Intensity.
Simple penetration of this spell by a boosted detection spell does not dispel the overall effect, though the target is clearly detected. Future detection spells must still be boosted to penetrate the Detection Blank.
This spell does not block spells such as Second Sight or Mystic Vision, nor any skill.
MYSTIC BLOCK Touch, Passive, Temporal
This spell blocks all detection of magic on the target if the detection spells don’t overcome this spell’s Intensity. It does not even leave a magical glow on the target: i.e. it appears that the target has no spells on. This is rumored to actually exist, but only by the top Magi.
MYSTIC CLOAK Touch, Passive, Temporal
The spell creates a barrier to spells such as Mystic Vision, Soul Sight, and Second Sight. The target does not even detect to these spells except for Intensity 10 Mystic Vision (which only reveals the presence of a cloaking spell). Spells such as Detect or Find Enemy or various other sense spells are totally unaffected.
This spell also blocks a discorporate being’s ability to see the target’s POW aura. This includes spirits using one of the three previously mentioned spells as well as the innate abilities of ghosts, wraiths, and other such ethereal creatures.