Engrave Helm - Rapid Killing
Client records describe this reading. They do not confirm availability in gameplay.
Current client record
Engrave your helm with the Rapid Killing rune: Reduces the cooldown on your Rapid Fire ability by 2 min. In addition, when you kill a non-trivial enemy or it dies while afflicted by your Serpent Sting, you gain Rapid Killing, increasing the damage of your next Shot ability within 20 sec by 20%.
Sourced change history
No changes in the tracked log could be matched to this record. This does not mean the ability or item has never changed.