"Oh. You want to know about the vengeful spirits, do you? Then I would be happy to share it."
There was a beaming smile on Satori's face now. Finally, a chance to highlight just how important her and Orin's duties were.
"Vengeful spirits are the aftermath of what happens to those who suffer particularly horrific or painful ends. Generally they're still sentient but the level of mental faculties they have access to can vary. They're a little like ghosts. Most are kept here in the Underground but if you've ever encountered the Gensokyo citizens Mima or Tojiko, I do believe they're both vengeful spirits.
A vengeful spirit is quite dangerous. Capable of possessing both human or youkai, though youkai have magic defenses that make it a bit more difficult. They feed off of magical energy. The same form of energy that keeps a youkai alive and runs through our bodies. Which means if a Vengeful spirit hops into us when they hop out we'll be left significantly weakened ... that is if they don't kill us by consuming all of our energy.
Some vengeful spirits can even use the abilities of the person they're possessing. If one hopped into your body, they could zoom all over Gensokyo pursuing new victims. Very scary stuff.
Kasha, such as Orin, Anna, and young Fuwa, are significantly more resistant to the powers of vengeful spirits. As such they're able to keep them under control. On the other hand, I was given my position because my mind reading abilities allow me to prevent any escape plots among them.
Though, I should further clarify, just because they are dangerous and suffered a horrible fate in life does not mean all vengeful spirits are malicious or hostile. Many of those that dwell here are quite pleasant. One could even call them our allies. Yes we protect the outside world by keeping them here but we also protect them from outside threats. Orin and I both have many spirits among our conversation partners.
The most dangerous vengeful spirit is someone that must always be monitored, however. Miyadeguchi Mizuchi, the jailbreak king. Her special ability allows her to possess victims far easier than any other spirit. By placing her spirit within a liquid, she can possess anyone that consumes it. She's also very hostile towards youkai. Our number one prisoner without a doubt."
Finally, after minutes of expositing, Satori suddenly stopped to take a break. She may have gotten a bit overenthusiastic about proving that what she did was important. Realizing how embarrassing ranting like this was, she seemed to shrink up as she sunk into her chair from embarrassment.
"... So yes, that's what vengeful spirits are like."
