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Complete Arcane p.161
Spellstitched creatures can be created only by a wizard or sorcerer with the Craft Wondrous Item feat and of sufficient level to cast the spells to be imbued within the undead’s body. The creation process takes a number of days equal to the Wisdom score of the undead creature being spellstitched (so a minimum of 10 days) and requires the expenditure of 1,000 gp for carving or tattooing materials in addition to 500 XP × the undead creature’s Wisdom score.