R.D: What is your goal in life?
Soul: What does your collar mean?
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R.D: Oh, nothing much... just absolute control over all realms and universes, total world domination where I am the only one in power, and no one to stop me or challenge my reign ever again. I have the power to do that all now, even! But I've been taking my time with it... enjoying the fun while it lasts.
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Soul: Believe it or not, it's really just there to stop R.D. See... I've learned something from watching them go about all their evil plans. They do this thing called "resetting" someone... now I don't need to go into detail, but they do need to get to someone's neck to do it, something about... drawings. Anyways, that "resetting" of theirs is all part of their plan to make people listen to whatever they say. It basically just recreates you into whatever they want you to be. Any sort of passion, personality, or anything else you had that made you unique? It's like it never existed, if R.D didn't want you to keep it. You become robotic, and you lose yourself... So I figure, if I block them from doing that to me, they won't have any control over my life like they so badly want. I can stop them with this one thing.
As for the word on it? Oh, that has no special meaning. It's just to make R.D lose their mind every time they see it. It never fails really, they see that and for whatever reason it hurts their ego and makes them mad. :)