Desecrated Headpiece

Desecrated Headpiece is a tier 3 armor token. It can be exchanged along with various items at various NPCs at Light's Hope Chapel for the following items:
 * Redemption Headpiece
 * Cryptstalker Headpiece
 * Earthshatter Headpiece
 * Dreamwalker Headpiece

Source
This item dropped from Thaddius in the original version of Naxxramas.