Create Greater Undead

You touch a pile of bones and/or corpses, and utter a string of foul black magic that stems deep from the shadow weave itself in order to store a spirit into a fearsome vessel created from the pile of bones and corpses consumed by the spell, and is puppeteered by you. Upon casting the spell, you choose the vessel's form from an existing undead statblock whose challenge rating is equal to 4, and it appears from where the pile was beforehand. The spell ends when the vessel hits 0 hit points, or when you break concentration, causing the vessel to crumble into dust.

The undead vessel has a mind of its own thus it can either act on its own or under your mental commands as long as you maintain control over it at the start of each of your turns as using your bonus action, otherwise the vessel can only move and defend itself from hostile creatures or use the dodge action.

When you maintain concentration for the full duration, the undead vessel becomes permanent and lasts until dispelled, the vessel drops to 0 hit points or whenever you cast the spell again.

At Higher Levels: When you cast this spell using a spell slot of 5th level or higher, the CR increases by 1 for each slot level above 4th.