Heals a rift entity a little every round. Rift energy flow makes this spell heal more per round, gaining levels makes it cost more spell points per round.
The in game help reads:
No saving throw. Casting time: 2 rounds. Type of spell: heal spell. Affecting stats: int/wis. Cast type: rift. Spell point cost: 60. A riftwalker can heal their entity by drawing rift energy from the void and focusing it on their minion. Knowledge of rift energy flow is known to help the effect of this spell. It also works on other riftwalker entities, allowing you to assist in the regeneration of anothers entity.