Some half-elves are born naturally akin to water. These are called hellves. They have far more robust health, and tend toward the elaborate costumes and adornments of their elven side. Many wear enough shiny baubles that merchants in the seashore towns have taken to selling hellves bells for quite some time. On water, these hellves are practically indestructible. They can breathe water as well as air, therefore cannot be drowned. They are agile in the rigging of a ship, and can easily swim to the bottom of the deepest seas. They speak in the tongue of the sea creatures, and often make excellent spies.
Hellves tend to remain open and childlike their entire life. They have a naivite that wants to believe the best of anyone, or any situation. Nature has balanced this with an uncanny sense of things not being right, or someone not being quite who or what they say they are. They are innocent and trusting, yet can turn into your worst nightmare should you betray that trust. Hellves see the world through rose-colored glasses, but also have eyes that can see red.