Rank 1
Killing a non-trivial target afflicted by your Drain Soul increases your Mana regeneration by 50% for 10 sec and allows 50% of normal Mana regeneration to continue while casting.
Soul Harvest
Client records describe this reading. They do not confirm availability in gameplay.
Current client record
Rank 2
Killing a non-trivial target afflicted by your Drain Soul increases your Mana regeneration by 100% for 10 sec and allows 100% of normal Mana regeneration to continue while casting.
Sourced change history
2026-10-01 · Rework
Renamed from Soul Harvesting; now correctly grants Mana regen bonus
Sources: WoW Forever Beta Development Notes – Updated October 1