Summon Undead

level 3 - necromancy
Casting Time: 1 action
Range: 90 feet
Components: V, S, M (a gilded skull worth at least 300 gp)
Duration: Concentration, up to 1 hour

Description not available (not OGL).
But here is a summary:

Summon 1 undead spirit (ghostly, putrid, or skeletal), friendly (stat block/your lvl).
Warlock
Wizard
Tasha´s Cauldron of Everything
5e tools