Undead Distilation Circle

Casting time: Dependent on CR lvl of Undead (1 minute for undead below cr 1 and 1 hour for cr 1 with 1 extra hour for each cr lvl above 1)

Start by drawing a magic seal around the undead and placing a bottle above it. You then spread the holy water in a circle around the edge of the magic circle while you channel magic into the circle. As the magic channels it begins to dissolve the undead into a strange potion that it places into the bottle. The undead makes a constitution saving throw against your spell DC. if it saves it doubles the needed time for the ritual. You can't leave the circle while the ritual is in progress. If the undead breaks its binding while in the circle you both will be trapped inside the circle until the full duration, or you die causing the spell to fail.

If the spell fully succeeds the undead will be distilled inside the bottle as a solution that has a necrotic swirling color. you can throw the bottle to release the undead and it will serve you as if under the charm effect for 1D6 hours after which it will turn on you. You can also use the bottled undead as a fuel source that can power spells or to replace gold value materials needed for spells equal to 100gp x the CR lvl of undead. If the bottle is dispelled the undead will appear in the nearest free zone to you and be hostile.

Undead in the bottles don't dissipate and will last until used or the bottle is dispelled or destroyed.