In your presence, no one can tell a lie. This power is retroactive, making it that any statements said in your presence must be followed, no matter what. If someone said they will kill Butcher in front of you, they will do so, even if they don’t want to. This doesn’t magically increase their capabilities, so you can’t just have someone say they will kill an Endbringer and expect it to work.
Someone is Lying
Your power has grown. Now, you are able to choose if you wish to make it impossible to lie or to simply know whether someone is lying, telling half truths or full truths. From there, you can twist it. If someone claims to have survived a war (a truth), you can make it so that this is a lie in their head, or if someone said that they dislike fighting (a half truth), you can make it a truth and turn them into a true pacifist. This fabricates the necessary memories to make the truth make sense to the target. This doesn’t give/take away any skills, instead the memories gained will explain away on why they have/don’t have certain skills. Perhaps that while they never were in a war, they picked up fighting from the streets, or they are a pacifist due to gaining an enlightenment.