Phantasmal Force (Illusion)
Level: Mage 1, Bard 1, Twilight Huntsman 1
Mana: 4. Long duration. Base Success: 75%.
  This spell creates an illusionary creature, force or object. The illusion affects only one sense, and is therefore automatically disbelieved by any creature with tremorsense, sharpened senses, scent or blindsight. An illusion created by this spell winks out of existance if even one person (other than the caster) disbelieves it.
   Sustaining a Phantasmal Force requires concentration -- the caster suffers a -2 general penalty while the illusion is active, and suffering damage requires a Concentration check (DC 11 + the amount of damage) to avoid the illusion winking out of existance.