Note that I don't critic the usefulness of the power, or its balance. On a purely gamist point of view, this kind of power is perfect.
But when you are trying to describe it "in world" your DM's skill can really be challenged.
The best solution I read is the use of synchronism "they did not run that far because you yelled at them". Ok, I can live with that, when we are speaking about gobelins. But swarms ? Oozes ? They have removed the "charm" keyword in those kind of power, it makes thing really hard for the DM IMHO.
But when you are trying to describe it "in world" your DM's skill can really be challenged.
The best solution I read is the use of synchronism "they did not run that far because you yelled at them". Ok, I can live with that, when we are speaking about gobelins. But swarms ? Oozes ? They have removed the "charm" keyword in those kind of power, it makes thing really hard for the DM IMHO.