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This spell permanently prevented a wizard from learning any new spells within a specific path of power or school of magic designated by the caster. In some cases, seal path was so effective that it added the effect of the close path spell on the victim. It was, however, not without risks: if the target withstood the magic, it could be reflected on the caster.
In addition to using verbal and somatic components, both seal path and its reversed form required a specially crafted seal of polished metal. It had to be made from alloyed mithral and lead, engraved with the victim's name or sigil. It had a material worth of at least 1000 gp.