Deadraiser Wizard

Making the Deadraiser 5e compatible:

School of Animancy

Level 2: Undead Familiar: You have a skeletal animal that can take actions on your behalf but this animal has no attack. 10 HP, and can be any animal between the size of a mouse and a cat.

Level 6: Undead Thralls (book)

Level 10: Deadly Divide: You can take any Undead you created and split them into smaller Undead. The Undead with the greatest number of Hit Points (your choice if there is a tie) is the "primary" one. All modifiers, spells, and effects on the Undead when it is split remain with the "primary" one. The "primary" Undead remains of the type it began as, and every split version is skeletal and in the shape of your choosing.

Level 14: Command Undead (book)