Conjure Ketamine Ape

You summon a celestial of challenge rating 4 or lower, which appears in an unoccupied space that you can see within range. The Ketamine Ape disappears when the spell ends or when it is reduced to 0 hit points for one full turn.

The Ketamine Ape is neutral to you and your companions for the duration. Roll initiative for the ape, which has its own turns. It obeys no verbal commands that you issue to it. If you don't issue any commands to the ape, it is more likely to defend you from hostile creatures but will most likely attack any and all creatures, hostile or otherwise.

The Ketamine Ape's statistics can be found online. 

At Higher Levels. When you cast this spell using a 8th-level spell slot or higher, you summon 1 + spell levels above 7th Ketamine Apes instead. This inflicts proportionate damage unto the user equal to one-tenth of the Ketamine Ape's health per additional ape summoned.