The Dead Walk

Warlock Invocation
Level: Lesser, 4th lv.
Components: V, S
Casting Time: 1 standard action
Range: 60 feet
Duration: 1minute per caster lv
Saving Throw: None
Spell Resistance: Yes

You can turn the bones or bodies of dead creatures into undead skeletons or zombies (as the animate dead spell). Unless you include the normal material component for the spell (an onyx
gem worth 25 gp per Hit Die of the undead) as part of the process, undead created by this ability crumble into dust after 1 minute per caster level.

(Complete Arcane, Page 134)