Bait Humans Spell

Causes the image of a fabulously large and beautiful cut diamond to float in the air before the target.  The spell costs the caster 1 magic point per casting, lasts for five minutes, and can be repeated indefinitely.  Approximate range of the spell is one mile.  AS a target approaches the illusion, the diamond recedes at approximately the same speed, in the direction the caster wills, presumably to where the hungry cthonian waits.  As in sport fishing, the target decides whether or not to take the bait.  Only chthonians have this spell.  A variation, Bait Sand Dwellers, exchanges the image of  a floating diamond for that of a tender human haunch, dripping flesh blood.