Azareck's Serpentine Tongue

Harness the power of the Abyss and use your fiendish force of presence to dominate all creatures that can hear you. 

All Humanoids or Beast of your choice must make a Wisdom saving throw or be charmed. The charmed creature obeys your verbal commands and you can communicate with them telepathically. they will obey your command to the best of their ability and they cannot refuse. If they try or even think to tell someone that they are under a spell they take 5d10 Psychic and are silenced immediately. You can command the creature to attack those they consider allies or to commit self harm (provided the self harm isn't fatal), however they get to repeat the save at advantage - and on a success they break free of your control. If you tell them to do something that goes against their moral code they repeat the save at disadvantage, and on a success they break free. Normal commands are done as a Bonus Action and effects that require a saving throw to carry out take an action. Every 10 days they repeat the save to break free from your control, repeating the save at disadvantage. The spell also ends early if you die, however they are still dominated even if they fall unconscious or die. If you or one of your allies damage a charmed target they can repeat the save at advantage to break free. A Dispel Magic, Remove Curse, Greater Restoration and Wish spell also ends it.

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At Higher Levels: When you cast this spell with a spell sloth of 7th level it lasts 1 year and they instead repeat the saving throw every 3 months. When cast with an 8th level spell slot they are no longer aware that they are under a charm and can therefore no longer try to forcibly escape the charm unless told to harm an ally or commit self harm. When cast with 9th level spell slot it lasts until dispelled and when told to harm an ally or commit self harm, the save they make to try t break out is done at disadvantage.