This is for the NPC in Dratan by the landing pad for the Monster Combo. Pasted from LC Forum
Credits to: GMAracton, GameMaster: USA

	The monster combo system is a new instanced group dungeon available to all last chaos players. The point of the system is to allow players to choose what monsters they wish to battle and then places them in one of several dynamic battle fields. This is a really exciting addition to Last Chaos as it allows both high and low level players the ability to fully customize their battle experience.
	Where do I sign up!? 1) The Master of Monster Combo NPC can be found in Dratan City. Talking to this NPC will bring up the following options Note: The party leader must choose all the parameters of the dungeon. Once the party leader enters the dungeon the rest of the group will automatically be teleported inside.S
	Edit Mode http://farm4.static.flickr.com/3170/2617191652_92281fdabd.jpg In the edit mode party leaders can choose what monsters they want to fight inside of the monster combo dungeons. Currently players can choose up to 20 monsters to fight. Each slot is designated to one stage of the monster combo dungeon. Note: Players must choose at least 5 monsters to begin the monster combo. Monsters can be placed in groups of 5 up to 20 total monsters. Each monster slot represents 1 stage of the monster combo event. Note Note: Different monsters cost different amounts of gold. Max Entrance Fee = 1.8 million Minimum Entrance fee = 4,000
	2) Once the monsters have been chosen by the party leader you will be able to enter the lobby of the monster combo. Inside of the lobby there will be another NPC http://farm4.static.flickr.com/3102/2616366607_57d95045c4.jpg
	3) Once you party is inside you can begin the instanced dungeon. How to win monster combo a) Every monster that the players have chosen will be found inside of the monster combo dungeon. Players must defeat all of the monsters in order to proceed to the next stage. b) During the battle you must work as a team to defeat the immense armies of monsters. You must also watch for traps. Traps come in 5 varieties: Earth Wind Fire Lightning Water Heart Together they form Captain Planet If you or your party is caught in a trap you will receive 10% of your total health in damage. http://farm4.static.flickr.com/3031/2616366941_7a6a767c56.jpg c) After 5 stages prizes will be dropped for the players. These prizes consist of coins, that can be used to open various types of chests. These coins can be spent in the MC Market found at the Master of Monster Combo NPC in dratan.
	These coins can be spent in the MC Market found at the Master of Monster Combo NPC in dratan. MC Market In this screen players can trade in tokens gained from winning monster combo. There are currently 5 types of coins. Old Coin Coin of Membership Coin of Performer Coin of Manager Coin of Master Coins need to be accrued in certain amounts in order to open the chests that can be bought from the Dratan NPC. The contents of the chests include new accessories never before seen in Last chaos. I will not divulge all of the new accessories to you now, but know that they are different than any that have currently been found in game thus far.
	Known Bugs 1) Some of the monster combo accessories give 0% increase to critical rate. This bug has been documented and sent to the developers, a fix should be available within the next month. Overall I would say that the increase to critical rate option is bugged in general. So don't be surprised if it doesn't work. 2) Occasionally, that is to say, not often. Players who choose to leave monster combo will find themselves in the lobby with no NPC. There is not currently a fix for this bug.