The necromancer places burning, sweet smelling incense on the corpse’s forehead calling on the animate force of the void.   Holding zis hand on the corpses chest and speaking incantations, after 10 minutes of doing this, the corpse rises as an undead indefinitely under zis control (skeleton or zombie depending on the state of the corpse) with he same stats as the undead it just became. This undead cannot attack and cannot speak and is completely incapable of complicated behaviour such as craftsmanship, it only understands basic words in the language(s) it once knew.   The telepathic link between necromancer and undead is only of 30ft in range.   This undead is extremely proficient in manual labour tasks such as hauling and mining or farming but lacks the skills to create other items using those.   The necromancer can control a maximum of 10x proficiency bonus in skeleton crew undead at any time.