Simulacrum Spell
D&D Description of the Simulacrum Spell : Simulacrum creates an illusory duplicate of any creature. The duplicate creature is partially real and formed from ice or snow. It appears to be the same as the original, but it has only one-half of the real creature's levels or Hit Dice (and the appropriate hit points, feats, skill ranks, and special abilities for a creature of that level or HD). You can't create a simulacrum of a creature whose Hit Dice or levels exceed twice your caster level. You must make a Disguise check when you cast the spell to determine how good the likeness is. A creature familiar with the original might detect the ruse with a successful Spot check (opposed by the caster's Disguise check) or a DC 20 Sense Motive check.
Deeper info on this Dungeons & Dragons Simulacrum Spell
Note: Add a Reply about how you have applied the use of the Simulacrum spell in a previous Dungeons & Dragons scenario.