Conjure Lesser Devils

Conjure Lesser Devils
3rd-level conjuration

Casting Time: 1 action
Range: 60 feet
Components: V, S, M (a vial of blood from an intelligent humanoid killed within the past 24 hours)
Duration: Concentration, up to 1 hour
You summon up to a total of 5 Imps that appear in unoccupied spaces you can see within range. A Imp disappears when it drops to 0 hitpoints or when the spell ends.
The Imps are hostiles to all creatures. Roll initiative for the sumoned devils as a group, which has its own turns. The devils attack the nearest non-devil to best of their ability.
As part of casting the spell, you    can scribe a circle on the ground with the blood used as a material component. The circle  is large     enough to encompass your space. The    summoned devils  cannot  cross the circle or target anyone in it while the spell lasts. Using the material component in  this manner consumes it.
At Higher Levels. When   you cast this spell using   a spell slot of 6th or 7th level, you summon 10  devils. If you cast it using a spell slot of 8th or 9th level, you summon 20 devils.