Tempting Fate

Hel attempts to give The Dark Brother another host to corrupt, and control as it wishes by placing a powerful curse on them.
As her geist like hand waves the magic to create the curse, tangible shadow like tentacles erupt from the ground swirl around the target.
They start to cling to the target visibly and internally, thought they do not interfere with movement.

Target must succeed on a Constitution Save DC: 25 or become cursed.
On a successful save, the tentacles recoil and lash out one last time before disappearing.
The target takes 5D8+30 Necrotic damage and is not able to be cursed for 24Hrs.
Anything killed by this spell rises at the start of your next turn as a zombie that is permanently under your command, following your verbal orders to the best of its ability.
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On a failed save a visible curse is set on them.
The shadows surrounding the target adheres to their skin and equipment marking them till the spell ends, they die, is dispelled or they go out of range. (going out of range only suppresses the curse, but does not get rid of it. It reactivates as the cursed comes back into spell range)

5 red wisps appear atop of the cursed. The wisps cause no damage, and emit 5' of light.
The target has disadvantage on all saves and all attacks until the curse is lifted.

On each each of its turns the cursed must make a Wisdom DC 18 or Take 2D10 psychic damage.
On each failed save a wisp dissipates, counting down to their demise.

If Hel hits the cursed with her geist like hand, a wisp dissipates instantly regardless of damage dealt. (2 on a crit)
When the last wisp vanishes, the curse takes hold.
The shadows take over the cursed, forever changing them visually and making them a permanent slave to Hel.
(Their type becomes zombie, for the purpose of healing/damage or mind affecting spells)

Anything killed by the curse, or while under the curse resurrects next turn under Hel's permanent command.
(If the cursed was slain AFTER the curse took a hold of them, they are slain as normal.)