Spirit Tap
Client records describe this reading. They do not confirm availability in gameplay.
Current client record
Gives you a 0% chance to increase your Spirit by 100% for 15 sec after killing a non-trivial target or when an enemy afflicted by your Vampiric Embrace dies. For the duration, 50% of your Mana regeneration will continue while casting.
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.