Late in the night, a small but finely-specialized slime creature slips into the mouth of a party member. It is a mild parasite, which causes compulsions. It carries the knowledge of the slime queen's eggs that were stolen and are in the town of Vergum, and a request that the party recover them.
The target makes a will save when they awake. If they fail, life feels pointless and dreary unless they are actively working toward saving the eggs, and they will gain no exp until the eggs are back in the queen's care. On a success, the target knows of the eggs and the slime's plight, and will know of the desperation of the queen.
Vergum is a minor town most notable for its beekeepers and honey exports. Lately the town has had a growing problem of monstrous slime, attacking a few beehives and consuming the honey. Luckily for them, very recently a lazy baker named Dentch returned to town with a sack of delicious slime eggs, after setting out in the night. He claimed to have journeyed into the lair of the slime and slayed them all, capturing the eggs for a feast. When the party arrives in town, preparations for the feast are underway.
If Dentch is interrogated, he will admit that he snuck into the slime nest wearing a cloak soaked in vinegar to mask his scent, and stole the eggs while the slime were resting. He will insist that they should be dead, because he threw powdered lye and fled as soon as they begun to stir.
When the party brings the eggs back to the slime queen, she can grant them one of two specialized slime organisms. One can replace a missing limb, acting in that limb's place with the additional ability of being able to stretch up to five meters outside of combat. The other can restore one wound each week, so long as it is fed at least one ration per day or about a rabbit's worth of living flesh.
The eggs are actually tiny slime creatures, too small to even move. If they are fed enough, they can quite quickly grow large enough to make their own way back to the nest, which will cause quite a commotion in the small town.