Unholy Champion

The caster chooses an undead creature under his control imbuing it with necrotic power which takes the form of a dark, flaming crown, floating above the creature`s head. The undead gains the following benefits:

• The Unholy Champion is under your control without the need for repeated casts of spells like Animate Dead or Create Undead, for as long as this spell is in effect. The undead also gains advantage on saving throws against features that turn undead and immunity to features that destroy undead.
• The Unholy Champion regains 5 hit points at the start of its turn if it has at least 1 hit point. If the Unholy Champion takes radiant damage or damage from holy water, this trait doesn't function at the start of the undead's next turn. The undead also gains a number of hit dices until it has a number equal to the caster.
• The Unholy Champion gains half of the caster proficiency bonus (rounded up) to its AC and its attack rolls. The undead´s attacks are also improved with an additional 2d6 necrotic damage.
• The Unholy Champion intelligence score becomes 10 unless it´s already 10 or higher and gains the ability to speak one language that the caster knows.

You can only have one Unholy Champion under your control at any time.

At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the Unholy Champions attacks deal an additional 2d6 necrotic damage, additionally, you can grant your undead one of the following traits: undead fortitude, stench (save DC 8 + proficiency bonus + constitution modifier), creatures killed by the Unholy Champion raise 24 hours later as a zombie under its control (maximum of 12), multiattack (when the undead uses his attack action it can make an additional attack). Your Unholy Champion can not gain a trait that it already has except multiattack. When you cast this spell using a spell slot of 9th level your undead gains a +4 and a +2 to two stats of your choice, another undead trait from the previous list, an additional 1d6 necrotic damage to its attacks and it becomes immune to spells and effects that dispel magic.