This was a 3x D&D spell.

Summon Undead 1st level
Necromancy
Range 60 feet
Duration: Concentration up to an hour.
Components: V,S,M (a 100 gp Black Pearl)

This spell calls forth two Zombies or Skeletons that will obey the caster's commands for the duration or until destroyed. These undead do not count against the total number of controlled undead the caster can have.

Upcasting calls forth either eight of the above, or any combination of undead up to the CR equal to the level of the spell.

(Still trying to figure out if this is fairly balanced...)