Argul's Necromancy of Necromancers

Touch the corpse of a necromancer, and speak the ancient tongue of Argul while infusing a magical item and a gemstone of a necromancer separate to the one you are casting this spell on. The creature can roll a dc 12+your spellcasting modifier wisdom saving throw, on fail, the effect continues, on success, the spell ends with no effect. 

The corpse turns into an animated undead creature with a skeleton stat block that can speak common and follows your commands. It can cast 'Animate Dead' (2/day), 'chill touch', 'summon undead' (1/day). The creature, along with it's minions perish after 24 hours unless this spell is recasted on them before the timer ends. 

You can only have 1 Necromancer undead minion active at a time, if casted again on another necromancer the first one perishes.