Gripsoul

Gripsoul is a +6 keen longsword, but instead of dealing additional damage on a critical hit, the weapon imprisons the victim in a gem set in the pommel of the sword as per a binding spell heightened to 16th level (DC 30). The same is true of any blow that would otherwise kill a foe or knock him or her unconscious. Only one creature can be so held, but the wielder can release the bound soul at any time with a command word.

Prerequisites: Craft Magic Arms and Armor, Craft Epic Magic Arms and Armor, binding.

Cost to Create: 934,500 gp, 28,440 XP, 1,857 days.

Source: Standard Reference Document under Open Game License v1.0a, which updated this item originally published in the Epic Level Handbook, page 134.