I think the following fact is worth of notice.
The Japanese have many traditions regarding balls of light. One of these is the
kitsunebi (fox fire), which is regarded as some sort of magical lantern used by foxes to get around during the night. When many
kitsunebi are seen together they are believed to be a
kitsune no yomeiri (fox wedding procession).
As you may well know the fox is regarded by many Asian cultures to possess many supernatural powers and to be one of the animals more likely to attain those powers making them
mononoke (minor deity or extremely powerful spirit).
Another tradition worth mentioning is the
kosenjobi (ancient battlefield fire): the balls of light seen near places where many deaths have occured are believed to be generated by the sorrow of those who fell without proper religious rites which makes them unable to reach the afterlife. They linger around their deathplace trying to harrass or hurt the living.
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Fas: Ite, Maledicti, In Ignem Aeternum.