Since this is L2 Support and the instructions say: If you are looking for a mob post on this board, I wanted to put up the link & information about the Drop Locator.
[Only Registered and Activated Users Can See Links. Click Here To Register...]
On the left side are two search boxes
If you are looking for a mob or NPC Type in the "Search Monster/NPC" the name or partial name, and it will bring up a list of matchs. Click again on the name for more incformation (And a map of the location)
Every Mob/NPC in the game is marked on the map with an X
If you go to that location on the map and find nothing, it is possible it is above or below your location. The necros/cata mobs dont say they are under the ground, but they are for example. Also some places have several layers like TOI. You will get used to those kinds of situations, but overall this droplocator is an extremely usefull tool, especially on quests.
Also if you are in the game looking for a mob, and you know it is near or you want to check if it is near you type /target name
If it becomes your target you can type it again to move to it, and you will start walking toward it.
Similar to the Monster Search is the Search Item. Here you can put in an item you wish to get as a drop or spoil, and it will tell you which mobs drop or spoil this and at what %. (remember that's before the drop rate for the server has been applied, so your drop rate will always be higher than this number)
You can click on the mob name and get more details about the mob, including location at this point.
Very handy tool, if you haven't checked it out, you should. ;)