Summon Greater Demon

Duration: 1 hour, Concentration
You summon a demon whose CR is 5 or lower.
You can issue a command to it on your turn and
it acts after you. If you issue no command, it
attacks anything that has attacked it. At the end
of it's turns, it makes a Cha save and if you say its
true name, has disadvantage. On a failure, it
continues to obey you. On a success, or when you
lose concentration, your control of it ends and it
attacks anyone near it. At Higher Levels. Each
extra spell slot increases