Planar Ally

You beseech an otherworldly entity for aid. Choose a celestial, an elemental, or a fiend. This entity sends a willing creature of that type that is known to you (it can be a specific individual you know the name of) to appear in an unoccupied space within range. The creature is friendly to you and your companions for the duration. When you cast the spell, you can specify a task for the creature to perform. The task can be no longer than the spell’s duration. If the task is something the creature would reasonably be unwilling to do, it refuses. At the end of the spell’s duration, the creature returns to its home plane. The DM has the creature’s statistics.