A bard and two rogues created a crude form of this by tying a Wand of Hold Monster to the forestock of a crossbow.
This crossbow enchants its target freezing him in place. While the owner shoots and delivers a coup de grace. Moderate Enchantment (Mind Affecting); CL 9th; Craft Magic Arms and Armor, hold monster Price 16,740gp Cost 8,370 XP 4185
Dungeons and Dragons Player’s Handbook v3.5 p.157 Helpless Defenders
“A helpless opponent is someone who is bound, sleeping, paralyze, unconscious, or otherwise at your mercy. Coup de Grace: As a full-round action, you can use a melee weapon to deliver a coup de grace to a helpless opponent. You can also use a bow or crossbow, provided you are adjacent to the target. You automatically hit and score a critical hit. If the defender survives the damage, he must make a Fortitiude save (DC 10 + dame dealt) or die. A rogue also gets her extra sneak attack damage against a helpless opponent when delivering a coup de grace. Delivering a coup de grace provokes attacks of opportunity from threatening opponents because it involves focused concentration and methodical action on the part of the attacker.
You can’t deliver a coup de grace against a creature that is immune to critical hits, such as a golem. You can deliver a coup de grace against a creature with total concealment, but doing this requires two consecutive full-round actions (one to “find” the creature once you’ve determined what square it’s in, and one to deliver the coup de grace.”
Dungeons and Dragons Player’s Handbook v3.5 p.241
Hold Monster
Enchantment (Compulsion [Mind-Affecting]
Level: Brd 4, Law6, Sor/Wiz 5
Components: V,S,M/DF
Target: One living creature
This spell functions like hold person, except that it affects any living creature that fails its Will save.
Arcane Material Component: One hard metal bar or rod, which can be as small as a three-penny nail.
Hold Person
Enchantment (Compulsion [Mind-Affecting]
Level: Brd 2, Clr 2, Sor/Wiz 3
Components: V,S,F/DF
Casting Time: 1 standard action
Range: Medium (100ft + 10 ft/ level)
Target: One humanoid creature
Duration: 1 round/level (D); see text
Saving Throw: Will negates: see text
The subject becomes paralyzed and freezes in place. It is aware and breathes normally but cannot take any actions, even speech. Each round on its turn, the subject may attempt a new saving throw to end the effect. (This is a full-round action that does not provoke attacks of opportunity).
A winged creature who is paralyzed cannot flap its wings and falls. A swimmer can’t swim and may drown.
