Ghastly Dragon

Its damage is similar to a Plaguesmith's, but with stronger attacks, especially the curse, so don't let your hp drop below 1500 and do not underestimate them. This creature was added with the Christmas Update 2009. Their head looks the same as that of a Wyrm.

Official Creature Artwork

These creatures run at low health, and a very good thing about them is that they don't change attack often.

A ghastly dragon attacks in melee range.

All vocations: The Ghastly Dragon's death attacks should be less effective if you wear a Death/Butterfly Ring or Koshei's Ancient Amulet/Cobra Amulet. Depending on your vocation, you can use one of the following: Skullcracker Armor, Robe of the Underworld, or Divine Plate. It is also advisable not to fight a Ghastly Dragon while cursed, as they will make you receive 20% more Death damage from time to time. Be careful, otherwise you can take up to 1721~ curse damage. A good tactic if you have a mage or paladin in the party is to use fire bombs or fire walls. As long as someone is next to it, it will not leave even when it is in low hp to run.
Knight: It is strongly not recommended to hunt them for profit due to a lack of ability to cure curse. You will find yourself healing the curse damage even after the Ghastly Dragon is dead. You should be at least level 140 (160+ if you are going to hunt them in Zao Palace) because it is common to encounter 2 or more Ghastly Dragons together. Using any death protection will help to decrease its curse attack.
Paladin: You must be at least 130 level with a distance skill of 90+ to solo this creature without waste. Use Assassin Stars (Much more waste but safer) or Crystalline Arrow / Prismatic Bolt to kill it faster. Remember to bring lots supplies with you and be ready to heal yourself just about every 1-2 hits. Make sure to use Cure Curse before the curse hits too high. Its also a good idea to use the equipment available to your level as Yalahari legs (Lvl 80, death 5%), Koshei's Ancient Amulet (No level, death 8%)/Cobra Amulet (Level 250, death 9% and armor 4), optional Divine Plate (Level 75, death 10%), Elite Draken Helmet (Level 100, death 3%), Death Ring (No level, death 5% for 8 minutes)/Butterfly Ring (Level 50, no charges or time, death 3% and armor 2). A good strategy is to put a fire wall down and run it around the fire wall. This will reduce the damage you take and increase your profit. Higher level Paladins (starting at around Level 250) can use a Bow of Cataclysm, gather 4-6 Ghastly Dragons and kill them with Diamond Arrows, Divine Caldera and Thunderstorm Runes. Using a Paladin Familiar at the same time is very helpful.
Mages: It's very hard to block them, because curse can hit for over 900. Killing them while running isn't easy, since it uses paralyze frequently.