Corpsecrafter Apprentice

You have spent time focusing on how to make superior undead soldiers rather than other aspects of necromancy. Perhaps you discovered an ancient Grimoire from Moil or studied under a priest from the Blood of Vol. However you learned these techniques you gain the following benefits: 

• Undead you create add your proficiency bonus to attack rolls they make, and add half your proficiency bonus to damage they deal.
• Undead you create use your Spell Save DC for any effects or abilities they use that cause another creature to roll a saving throw.
• Undead you create are proficient with any weapons or armour you are proficient with, and any weapon or armour they were proficient with in life.
• Undead you create gain 2 HP for every level you have when you create them.

These benefits are not without cost however. When you enhance an undead you create using this feat, you must spend 1 of your hit dice to fuel the enhancement. As long as the undead you spend the hit die on is alive, you can't regain the spent hit dice by any means. Should the undead you created with this feat die or be destroyed, you can regain the spent hit dice as normal. Additionally as part of the spell used to create the undead enhanced by this feat you must also include powdered gems with a total cost of 25gp per your level as a material component that the spells consumes.

This feat does not increase the intelligence or tactical knowledge of undead you create, a zombie that drops it's weapon will still need to be instructed to pick it back up for example.