Satisfied with his earnings, Iko slips the bag of coins into the interior of his robe.
"The spirit realm is home to many entities. Some malevolent, other benign, and most with goals beyond our comprehension. Demons, and the Oni, are among those spirits with malevolent desires." He takes a sip of his tea before continuing.
"Demons are a wide classification. To be clear, any spirit whose essence is twisted by negative emotion becomes a demon. There are those of anger, fear, woe, lust, even hunger. It is said that it was the mortal heart that created the first of the demons, who ravaged the spirit world before being confined by the Spirit Lords. Only after was the spirit world allowed to return to a state of peace and serenity, outside of the get prison pits constructed for the demons."
"The Oni are a bit different, in a way. The Oni are a certain type of demon, capable of reaching into the physical world for periods of time. They can manifest themselves in many ways, but not for longer than a few minutes. Often, they take this time to find a foothold of sorts. They are drawn to people who experience strong emotion similar to what has tainted their essence. Once they possess this person, they have a permanent foothold in the physical world to wreak havoc. The Oni are not just strong and tough, but cunning, and full of strange magic. Very dangerous, and to be slain with extreme prejudice. Oni are creatures of malice, hatred... conquest. They crave the feeling of domination over what they see to be lesser beings. To let an Oni survive for long is to bring destruction upon all it can lay its hands on."
Iko takes a deep breath, pushing away the dark thoughts of demons in a practiced motion.
"So again... why do you ask?" he repeats, a bit more forcefully.