Level: Cleric 4, Sorcerer 4, Wizard 4
Components: V, S, F
Casting Time: 1 standard action
Range: Touch
Target: Corporeal undead creature touched
Duration: 10 minutes/level
Saving Throw: Will negates (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.
You cause the skeleton of the target corporeal undead to change to iron. This gives the subject a +6 enhancement bonus to its existing natural armor.
Arcane Focus: A miniature skull carved of granite.
Source: Spell Compendium, page 125.