How do you get a pet dragon on maple story

First, you buy a dragon egg from the cash shop for 12,000 nexon cash ($12). Then you treat it as a normal pet. Eventually, it will hatch into a baby dragon. Continue to treat it as a normal pet. Finally, it will grow up into one of various dragons. This requires a lot of patience. If the pet expires before it hatches or fully grows, you need to buy water of life from the cash shop for 2,400 nexon cash ($2.40) and take the pet doll and the water of life to Mar the fairy in ellinia.