New creature in Summer Update 2008. After changing the looktype of this creature, CipSoft made a mistake, causing the items within the corpse to end up outside at the moment of disappearing (when rotting/decaying). This bug was fixed in Updates/8.41.
For all vocations: Their wave attacks cover more area than other monsters wave attacks so is harder avoid, still standing diagonally is your best option. They run and heal fast so kill them against a wall so they can't escape. Also: You need to go up and down a lot to hunt them so levitate spell is a must or bring Ice Cubes or Pots (monsters don't push them) and you can use them to do Ledgehopping to reduce the damage you take. Mages:Run At them while casting Exori vis or more effective Exori Mort, beware of running into more monsters. Paladins: Stair hop or use shield and throwing weapons (running from them is very hard), you need decent skills to solo them (around 70/60 skills), they're weak to melee so Ethereal Spear can do more damage than Divine Missile. Knights: At level 65 with skills 70/70 you can easily hunt them using Scrapper arena weapon or any Twohanded weapon with 45+ attacking 2 Young Sea serpents isn't a big problem just Exori (easily 200+ with magic level 6 and level 70) or exori gran (easily 400+ with ml 6 and level 70) Just watch out so you don't get a Sea Serpent attacking you while killing a young one because then you have to waste a lot of Mana potion and Strong Health Potion to make sure you won't die, try to avoid the waves and prepare for no profit.