Until the spell ends, when you would be made to make a Charisma check, you instead automatically succeed on that check. While the spell lasts, people will believe anything you say regardless of how outlandish it may be. You cannot convince a person to do something that would cause them physical harm or would cause them to die. Additionally, no matter what you say, magic that would determine if you are telling the truth indicates that you are being truthful.
When the spell ends any person you have interacted with will become suddenly aware that magic was involved.
If you cast this spell at 9th level, you channel such raw magic through your words that you are able to talk people into harming themselves severely. If you tell a person to do something that would cause them harm, they must succeed on an Intelligence saving throw. If they fail, they instead imagine doing that action and take 8d8 psychic damage, ending all effects of the spell for that person. If they succeed, they otherwise refuse to act as they would had you cast the spell at 8th level. A person cannot be commanded like this again for 24 hours regardless of whether they pass or fail the saving throw. Additionally, a person affected by the spell in any way will either not be aware of any magic involved, or not remember the time involved in the interaction (caster's choice).
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