Apprentice Necromancer

You have started down the path of necromancy and that of raising undead to do your bidding. As part of your studies you have learned how to infuse a part of your soul into a skeleton to create a soul-bound minion. This creature is a loyal servant that follows your commands and accompanies you on adventures if desired. 

The skeleton has a number of Hit Dice equal to your character level, increasing its hit points as normal. Additionally the skeleton adds your proficiency bonus to attack and damage rolls it makes. The skeleton is proficient with any weapons and armour that you are, in addition to the weapons and armour on it's stat block.

As part of the creation of your Soul-Bound Skeleton , you must expend 1 of your hit dice. As long as your Soul-Bound Skeleton is alive you can not regain the spent hit die by any means. Should your Soul-Bound Skeleton die or be destroyed, you can regain the lost hit die as normal. If this sidekick dies, you can replace it by using a ritual that takes 8h to perform, requires you to spend 1 of your hit dice, and costs 100 gp in candles, incense, chalk, and onyx. 

Additionally when you reach 5th level, you learn the spell animate dead which you may cast once per long rest without expending a spell slot, and you may cast it as a ritual.