Blood Warriors

You transform your life essence into protective sentries under your command. As an action, you transmute a portion of your own blood into a vaguely humanoid Blood Warrior construct that follows your commands. When you cast the spell, a Blood Warrior construct appears in an unoccupied space within 5 feet of you. You can issue commands verbally or telepathically, no action required. In order to communicate telepathically with your blood warriors, they must be on the same plane of existence as you and no more than 500 feet away. If no instructions are given, your blood warriors follow and defend you, but otherwise take no actions. Each blood warrior gains a bonus to its AC equal to half its master's Constitution modifier rounded up (minimum 0).

When you cast this spell, you can also choose to sacrifice your hit dice to empower your summoned blood warriors. When you sacrifice a hit die in this way, a summoned blood warrior you choose no longer requires concentration to maintain and lasts until it is destroyed or dispelled, its bonus to AC is now equal to its master's Constitution modifier, and the hit dice used to enhance it no longer regenerates over time. In addition, your enhanced blood warrior gains a bonus to its HP equal to twice the maximum roll of the hit dice you sacrificed and gains advantage on all of its Constitution saving throws. Blood warriors can only be enhanced with one hit die at a time. If an enhanced blood warrior is destroyed or dispelled, the hit die it consumed can once again regenerate as normal.

At Higher Levels: When you cast this spell using a spell slot of 5th level or higher, you can summon one additional blood warrior for every slot level above 4th.