Undead Lieutenant

You imbue one undead creature that you control with enhanced sentience and, if required, the ability to speak one language of your choice, such that you can delegate some degree of command to it. When you cast this spell on a creature with an Intelligence less then 5, it's Intelligence becomes 5 for the duration. You may explain an objective or set of objectives for the lieutenant to achieve. These may be as abstract and complex as you wish, and the spell's power compels the target to understand your orders.

Undead creatures under your control obey the Lieutenant as if it were you. You can give orders to your Undead normally, superseding the orders of the Lieutenant.

On each of its turns thereafter, the lieutenant can use a bonus action to mentally command any of its subordinates, as long as they are within 60 feet of it - it will use this ability whenever it can in pursuance of the objective(s) you set. It can command any or all of them at the same time, issuing the same command to each one. If it issues no commands (such as if it is incapacitated or out of range), the subordinates only defend themselves against hostile creatures. Once given an order, a creature continues to follow it until its task is complete.

While the undead lieutenant is actively giving commands, it empowers the undead around it. in a 60 ft. radius around the Lieutenant undead under it's command add your proficiency bonus to their attack and damage rolls (this feature is always applied to the Lieutenant, a Lieutenant can only benefit from one instance of this feature at a time).

Once created, Undead Lieutenants no longer need to be within range for you to maintain control of them (IE: via an Animate Dead spell), or the undead under their command (undead you control within 60 ft. of the Lieutenant), so long as they are on the same plane of existence as you, you need only spend a spell slot to do so.

If you lose control of the Lieutenant, or the creature dies, this spell ends.

At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, you promote one additional undead creature for every two slot levels above 4th, an additional insignia is required for each creature.