Jelly is a mountain troll located by the steps in the upper level of the Kurask area in the Fremennik Slayer Dungeon. If players attempt to attack the kurasks in the upper area, he will stop them from doing so, claiming the upper area is only for those who have kurasks as a Slayer task. His appearance is the same as that of Arrg.
As a child, he was abandoned by his parents in the cave. He learned to survive and became strong, and seeks to become a slayer master one day. Since trolls are named after what they first eat, Jelly ate one of the Jellies in the dungeon.