Magnesium Spirit Correction/Fix
An errata for Magnesium Spirit is available. It's also in the original Tome of Horrors Vol 1 for 3.5e. This will replace the current Blinding Flash which has an editor's note that it's missing and uses an unofficial version.
Blinding Flash (Su): Three times per day, a magnesium spirit can flare up its body in a blinding flash. All creatures within 20 feet viewing the flash must succeed on a DC 16 Fortitude save or be blinded (as the blindness spell) for 1d2 hours. The save DC is Constitution-based.