- Hotfix (2014-01-10): Spore Cloud now reduces the target's casting speed on player targets by 10% (down from 25%).
- Patch 5.0.4 (2012-08-28): 25% increased to 50%.
- Patch 4.0.1 (2010-10-12): Redesigned. No longer causes enemies to take nature damage over time and reduces armor. Now causes enemies to have their casting speed increased by 25% for 9 sec.
- Patch 3.0.2 (2008-10-14): Added.