Rossa is a letter that can be found on notice boards around Velen. It was written by the parents of a deceased child, warning villagers not to take advice from the Pellar. The letter cannot be added to the inventory, and only temporarily disappears from the notice board if the player takes it.
Good folk! Take no advice from the pellar! When our Rossa fell weak, he said to put her on a pine plank and stick it in a fired bread oven, then count to a dozen three times. When we pulled her out, she had burnt to a crisp and there was nothing left but to bury the charred bits. But the pellar refused to give back the three hard-boiled eggs we'd given him, saying he'd already eaten them.
—Wolfram and Annet