Design Proposal:
Worms of Muu- subtle version
Muu knows that in order to grow and spread her Heaven throughout the world, she must first spread the word and love of her cult. To that end, she has chosen to take a subtle but direct approach. A small worm, so small its eggs aren't even visible. The worms eggs hatch in the body after being ingested, and from there the worm will take root, burrowing into the body.
From here, they simply live. As the host goes about their lives, little will change. The worm will get hungry, and mess with the Hosts mind, they'll start to feel subtly worse. Like they woke up just a little off today. The effect will grow gradually, until the worm simply starves. Unless, the host does a sufficient act of Good. Small acts of charity, holding open doors for others, taking care of their environment, etc. You see, the worm feeds on Good, and when the host is good, the worm, no longer hungry, stops messing with the hosts body, instead producing subtle positive feelings.
The hosts start to feel better the more Good they do. Pushing them to be more charitable, more helpful, and more friendly towards others. It is from there that the cultists of Muu, who were previously subtly seeding these eggs in water supplies and food donations, reach out to them and ask if they want to be part of a Greater Good, thus bringing them into the fold.
The worms do of course have weaknesses. As we've already mentioned they can starve if not fed for over a week, but more noticeably is that those who are already infused with the touch of Evil, or bathed in its power regularly, will rapidly purge such worms from their body before they can fill more than slightly ill.
Worms of Muu- more overt version
Muu knows that in order to grow and spread her Heaven throughout the world, she must first spread the word and love of her cult. To that end, she has chosen to take a more direct approach aimed at the wealthier and nobler. A small worm, with small, black, delicious eggs. The eggs are sold as a form of caviar, a delicacy, to those who are extravagant and wealthy. The eggs hatch in the body after being ingested, and from there the worm will take root, burrowing into the body.
From here, they simply live. As the host goes about their lives, little will change. The worm will get hungry, and mess with the Hosts mind, they'll start to feel subtly worse. Like they woke up just a little off today. The effect will grow gradually, until the worm simply starves. Unless, the host does a sufficient act of Good. Small acts of charity, holding open doors for others, taking care of their environment, etc. You see, the worm feeds on Good, and when the host is good, the worm, no longer hungry, stops messing with the hosts body, instead producing subtle positive feelings.
The hosts start to feel better the more Good they do. Pushing them to be more charitable, more helpful, and more friendly towards others. It is from there that the cultists of Muu, who had previously sold said eggs, reach out to them and ask if they want to be part of a Greater Good, thus bringing them into the fold.
The worms do of course have weaknesses. As we've already mentioned they can starve if not fed for over a week, but more noticeably is that those who are already infused with the touch of Evil, or bathed in its power regularly, will rapidly purge such worms from their body before they can fill more than slightly ill.