Conjure Monster

You conjure a CR 1/4 Creature  that appears in a unoccupied space that you can see within range (It must be on the ground or water if it can't fly.)

it disappears when it drops to 0 hit points or when the spell ends.

The summoned creature is friendly to you and your companions. Roll initiative for the summoned creature, which has its own turn. It obeys any verbal commands that you issue to it (no action required by you). If you don't issue any commands to it, it defends itself from hostile creatures, but otherwise takes no actions.

summoned creatures glow 5ft dim light and are noticeably magical. 

At Higher Levels. At level spell 2 CR:1/2, At level spell 3 CR:2, At level spell 4 CR:3, At level spell 5 CR:4,At level spell 6CR:5, At level spell 8 CR:7, At level spell 9 CR;8