Ghoulcallers or Necro-choir members are a unique sect of the bardic colleges. They call on spirits of the dead to return and dance into combat. 

 

Whispered Songs of the Dead

At 3rd level you can reach out to the songs of long dead souls and use them to guide and inspire yourself and allies. You learn the guidance cantrip. It does not count against your known spells and counts as a bard spell. You can also cast it at a range of 60ft

Dance of The Dead

At 3rd level you gain the ability to summon spectral undead with a specific song to fight for you.
As an action you may expend two bardic to begin a song that summons a number of Ghoulcaller Spirits equal to half your proficiency bonus (round up) to your side. These follow your verbal commands and act after you in initiative (No action required to control). You must concentrate on this ability as if it was a spell, however does not take your concentration. If you are concentrating on both this and a spell roll for both each time you are hit. You may concentrate on this for up to 10 minutes.

Necromancin Dancin

At 6th level, you gain the spell Animate Dead, when you cast it you can spend a bardic inspiration to instead raise that many Ghoulcaller Spirits from the bodies. They act as they would from the spell except that you can heal their temporary hit points with your bard spells.

Necromantic Inclanations

Your dabbling into necromancy allows you to specialise into the craft more. You can swap any number of bard spells with necromancy spells. Their level cannot exceed your proficiency bonus. You may swap these spells whenever you level up.

Raise the Dead to Raise the Roof

Starting at 14th level, you gain the ability to once a day begin an powerful song. When you do you summon 10 Goulcaller Spirits that you can command verbally and act directly after you in initiative. You must concentrate on this effect as you would a spell, you may also concentrate on an actual spell making concentration checks for both each time you take damage. You may not have this effect and Dance of the Death active at once. In addition you become immune to being grappled, charmed, frightened, paralysed, stunned, restrained and unconscious. You gain immunity to Poison damage and resistance to Necrotic damage and advantage on all Constitution saving throws.