In order to purchase it the player needs to have completed before patch 6.0.2.
Patches and hotfixes
- Patch 6.0.2 (2014-10-14): No longer a quest rewards.
- Hotfix (2013-01-08): "Commander Oxheart in Townlong Steppes will now sell Crystallized Dread, Crystallized Terror, C rystallized Horror, and Eye of the Black Prince for gold to players that have completed the appropriate quest lines."
- Hotfix (2012-11-06): "Tooltips for Crystallized Dread, Crystallized Horror, and Crystallized Terror have been updated."
- Patch 5.0.4 (2012-08-28): Added.