By casting this spell the caster has made herself or whomever she touches immune to metal blades.
The Netbook of Witches and Warlocks
By Timothy S. Brannan and The Netbook of Witches and Warlocks Team
Level: Witch 5, Cleric 6, Druid 5
Components: V S AF
Casting Time: 1 action
Target, Effect, Area: Person touched
Duration: 1 round per level
Saving Throw: None
Spell Resistance: Yes
You gain damage resistance 25/Non-Metal against piercing and slashing weapons only, provided these weapons are made of metal. Once this spell has prevented 10 points of damage per level (Max 150) it is discharged.
Slashing or piercing weapons not made of metal (for instance, a druids wooden scimitar which has – ironwood– cast on it), or natural piercing or slashing attacks are not affected by this spell (presuming the attacker is not made of metal. Despite the name, Metallic Dragons do not count as metal). This spell also provides resistance against the spells Biting Blade, Ghostly Slashing, Phantom Lacerations, Dreadful Bloodletting, and Wave of Mutilation.
An athame is required to cast this spell as an Arcane Focus.