|This article contains canon information corresponding to the Tales of Arcadia franchise. That means all information in this article is true and has appeared/been validated officialy on-screen.|
It helps Changelings embrace their trollish nature, but in humans, it hones their feral instincts, making them as aggressive and violent as a Troll. However, if Gravesand is consumed, it boosts the effect tenfold.
Gravesand changes the human's nature, turns their eyes to yellow and their irises red. Changes from the Gravesand become permanent unless the victim achieves an emotional connection with their human feelings.
This is what changed Jim's voice when he was replaced with Emile Hirsch, making him sound like the Gravesand transformed/damaged Jim's vocal cords.