Embrace Undeath

The souls of the dead call to you, calm you and even sometimes aid you when you are in need. You resonate so harmoniously with the undead that whenever you have an undead creature under your control, the following benefits occur:

-You gain an increase to your Spell Attack Modifier and Spell Save DC by 1 while you have at least one undead under your command.
-The undead creature(s) has an AC equal to your Spell Save DC if not already higher.
-The undead creature(s) copy one of your Physical ability scores such as, Strength, Dexterity or Constitution. Or one of your Mental ability scores such as, Wisdom or Charisma. Intelligence excluded.
-If the undead was created by a spell of your own such as Animate Dead, the length of time under your control is doubled.
-You can use your action to cast a spell of 1st level or higher originating from an undead creature under your command if it is within 30 feet of you. If it is a necromancy spell one of three things can occur of the DM's choosing:
The target of the spell gains disadvantage on the saving throw. You have advantage on the spell attack roll. Or the spell deals maximum damage. You can use this effect up to three times per long rest.