Trident of the Son

<From the scratches he makes in the rock, you see several symbols: a trident, a mur'ghoul, the sun, a wrecked ship, and a rough stick-figure of yourself.>$B$B<Puzzling out what the murloc is conveying takes a while. Obviously he wants you to get a trident from the Chillmere Coast, but the image of the sun is puzzling. That is until you realize he means his son.>$B$B<His son was changed into a mur'ghoul! He wants you to find him to the south near the wrecked ship and return with his trident.>