Holocron

Siphon Life

Force power · Level 5 · Dark
power-typeForcelevel5alignmentDarkconcentrationtrue

⟜ Requires Drain Life

Tweaked from 5eYou already know this as 5e Vampiric Touch — It's your Vampiric Touch — drain a target for necrotic damage and heal for half each turn — but recast as a ranged Dex-save channel (4d8/turn on a failed save) rather than a melee spell attack.
Drain a creature for 4d8 necrotic on a failed Dex save, then 4d8 per action each turn; heal for half the damage dealt each time.
DamageHealing
●●breadth · dark-side, concentration
TargetingSingle
Use whena tough single enemy needs sustained damage while you need to sustain your own HP
ScalingDamage increases by 1d8 per slot level above 5th.
!Dark-side power — corruption cost applies; requires concentration and Drain Life prerequisite; you can only deal the ongoing damage if you take no other action each turn.
necrotichealingmind-affecting
Pairs withDrain Life · Dark-side sustain build · high Dexterity save DC
PlaystyleStrikerHealer

A tendril of inky darkness reaches out from you, touching a creature you can see within range to drain life from it. The target must make a Dexterity saving throw. On a successful save, the target takes 2d8 necrotic damage, and the power ends. On a failed save, the target takes 4d8 necrotic damage, and until the power ends, you can use your action on each of your turns to automatically deal 4d8 necrotic damage to the target. The power ends if you use your action to do anything else, if the target is ever outside the power's range, or if the target has total cover from you.

Whenever the power deals damage to a target, you regain hit points equal to half the amount of necrotic damage the target takes.

Force Potency. When you cast this power using a force slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th.

Codex
Casting Period
1 action
Range
60 feet
Duration
up to 1 minute
Concentration
Yes