Call Celestial

You summon a celestial of challenge rating 5 or lower, which appears in an unoccupied space that you can see within range. The celestial disappears when it drops to 0 hit points or when the spell ends.

The celestial is friendly to you and your companions for the duration. It takes its turn immediately after yours. It obeys any verbal commands that you issue to it (no action required by you). If you don't issue any commands to the celestial, it defends itself from hostile creatures but otherwise takes no actions. 

If you stop concentrating on the spell before it reaches its full duration, an uncontrolled Celestial doesn’t disappear for 1d4 rounds if it still has hit points and attacks the closest evil aligned creature it can perceive. If it perceives no evil aligned creatures it defends itself from hostile creatures but otherwise takes no actions. 

The GM has the celestial's statistics. (Sample: Pegasus)

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