- The cooldown also counts down while the Ultralisk is alive.
- (Patch March 14, 2017) Note: Cooldown increased from 70 to 80 seconds; Cooldown now also counts down while the Ultralisk is alive.
- (Patch May 17, 2016) Note: Cooldown reduced from 80 to 70 seconds.
- (Patch March 29, 2016) Note: Attack damage increased from 91 (+4% per level) to 100 (+4% per level).
- (Patch August 18, 2015) Note: Cooldown now begins once the Ultralisk is killed.
- (Patch July 21, 2015) Note: Can now be re-targeted after Kerrigan is killed.