[ She grumbles a bit under her breath, but in the end, she relents because Killua's going to find out either way if he asks around, seeing as it isn't all that uncommon, especially around teenagers who enjoy doing stupid things like this. ]

Essentially, it boils down to telling ghost stories. It's something you play in a group, in the dark, with the only light being a hundred lit candles that you put out one by one every time somebody finishes telling a story. After a hundred stories are shared, some sort of ghost or spirit or something gets summoned and it's never a nice one, and it's just a stupid ritual anyways, it's ridiculous and a waste of candles, so don't be surprised when it doesn't work.