cost: 50 mill
lvl requirment: Level 110
Mildun will talk about how he isnt allowed to teach you and your character will bribe him, choose the options so you pay 50mill.
he then says that someone knows about castle gear, this guy is located in gorge of silence on the right (east) of the entrance from kenji beach, very easy to find (his the only NPC there, in the deserted settlement)
he will tell you about a guy with an eyepatch, there a few guides with eyepatches in the game and if you go to the wrong one then they will tell you that " they dont know anything " you must go to the guide in forest of wisdom located south east of the map.
he will ask you a question and the answer is mana engine (option 2 if i remember correctly, if incorrect then you must go back to mildun to get the quest, you do not need to pay again though. this castle gear "genius" will now tell you everything he knows in about 2-3 paragraphs, you now go back to mildun (my chat glitched here but just keep goign along with it an read the questl log)
it should say you must go and see siegel in luna, hes just south of the smith by a few meters, he will explain how 4 ELITE monsters took some scematics of him and how they was to big for him to have faught back and stand no chance at winning.
***VERY IMPORTANT*** he also says they are VERY Strong and you should ask your freinds to help, you NEED to have 1 person at least in a party with you otherwise the quest item is impossible to get, not because the mob is to hard but because you cant actualy receive the schematic without being inside a party, another attempt with gms to promote partying. another thing to remember is these monsters have alot of health but arnt particulary strong
these mobs are located all around luna and only have 1 spawn per mob as far as i know, except for the mammoth which has 2 nxt ot eachother
these mobs are listed below and print screens are added
**********elite walverine in freezin platue just to the east********** it took me 4 kills to get drop (everyone is different)
**********elite elder mammoth crystal snowfields********** it took me 7 kills to get drop (everyone is different)
**********elite Tyrant warship in arumic valley********** it took me 2 kills to get drop (everyone is different)
**********elite behemoth in mount erectuia********** it took me 1 kill to get drop (everyone is different)
Please remember, if your unlucky, it could take you 20 times to get the drop. or 1 kill on each if your lucky.
most of these monsters are larger in size than your average monster, teh walverine is slightly bigger than the king wolf, the mammoth isnt noticably bigger, the tyrant very big and the behemoth... well i couldnt fit him in my screen, your see in the screenys
after you have been rewarded with your 4 schematics, go back to siegel and he will say go to mildun, take them to him and you will have a little discussion exchanging a few winks

this quest took me around 2 hours... mainly because i was killing the first Elite mob (tyrant SOLO) for 30 mins before readin the forums to see you needed a buddy
mob locations (click to enlarge pictures, then click it again once on imageshack.com to get it the right size)
WOLVERINE

ELDER MAMMOTH

TYRANT

BEHEMOTH

look at the screenys to see the MAP and your see the location :]