The Elves of V’ael are immortal as long as they stay in the forest’s mist. Once they leave, they become mortal. A dying V’ael Elf who returns to the forest, is restored to youth.
Pretty happy with this! The mist over the sea becomes the roots of the tree to represent the life-giving mist. Thought it might also be fun to show how I got here, this is maybe a quarter of the ideas I came up with that led here. You can see the idea of the wood and sea horizontal split was a gimme from the start but I played around with quite a few mist variations before I struck on the idea of the tree (which subsequently took a bunch of messing around).