In our world we have this thing called Mara, which is darkness, which is a big lumping together of all the negative emotions and stuff in people's hearts. Everyone has some! I have some, you have some. They're normal. However! Sometimes, external forces make Mara more powerful, and sometimes internal forces do.
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When external forces do, we have to fight them whenever we can, using the Lotis words, which purify darkness. Internal ones are harder because they're inside your heart, right? So we can go inside the heart to the inner heart, which is like- well, it's like those heart games that one Judge does- and we find the root of the darkness and we deal with it. Like if someone is really lonely because they just want to be loved, we go in there and use the word that means Love to help them be less lonely, that sort of thing. Sometimes it manifests as ugly demons and stuff, though, then you have to fight it manually.