Iron Bones(Spell Compendium, p. 125)
Level: Cleric 4, Sorcerer 4, Wizard 4,
Components: V, S, AF, DF,
Casting Time: 1 standard action
Target: Corporeal undead creature touched
Duration: 10 minutes/level
Saving Throw: Will negates (harmless)
Spell Resistance: Yes (harmless)
A brief flash engulfs your undead ally, and through its flesh you can see its skeleton. The skeleton glows a dusky red for a moment.
This spell functions like stone bones (Spell Compendium page 208), except that the subject creature's skeleton changes to iron. The creature gains a +6 natural armor bonus to AC.
Arcane Focus: A miniature skull made out of iron or steel.