|The subject of this article was removed from World of Warcraft in patch 5.0.4.
- Patch 5.0.4 (2012-08-28): Removed.
- Patch 4.0.6 (2011-02-08):
- Patch 4.0.1 (2010-10-12): No longer reduces the chance that spells and diseases the death knight cause can be cured.
- Patch 3.1.0 (2009-04-14): Moved from tier 2 to tier 1.