One last DnD spell for a bit.
Ultimate Sacrifice
9th-level necromancy
Casting Time: 1 action
Range: 100 feet
Components: V, S
Duration: Instantaneous
Chose a target in range and a willing ally. Both targets are instantly killed and are considered to have both failed three death saving throws instantly. If the willy ally has less hit points than the target, the target is allowed a Constitution saving throw to survive with no effect at all. If the target has double or more hit points than the willing ally, the target has advantage on the saving throw. The willing ally is killed regardless of the results of the target’s saving throw.