Summon Aberration

level 4 - conjuration

Casting Time: 1 action

Range: 90 feet

Components: V, S, M (a pickled tentacle and an eyeball in a platinum-inlaid vial worth at least 400 gp)

Duration: Concentration, up to 1 hour

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

Summon 1 aberrant spirit (beholderkin, slaad, or star spawn), friendly (stat block/your lvl).

Warlock

Wizard

Tasha´s Cauldron of Everything