Quartz
Hero
I do need to spend some time crunching the numbers on grapples and shoves,
KISS: apply Advantage if there's more than N zombies.
I do need to spend some time crunching the numbers on grapples and shoves,
but I would change the narrative at least to make it look more like a necro: Unseen Servant can be described as a ghost, Cloud of Daggers may change to a cloud of sharp bones, or make Tiny Hut look like a crypt or a tomb.
That drastically reduces the odds of success unless you set N = 2, in which case it's not saving any time.KISS: apply Advantage if there's more than N zombies.