Ludibrium Party Quest

Similarly to the Kerning PQ, the stages are beaten by collecting a certain amount of passes by doing specific tasks and only one party is allowed to enter the PQ on any channel. However, there are several key differences between this PQ and the first one. First off, you need a full party (6 members) that are between levels 35 and 50 to get in. It is also a longer to complete PQ with 11 stages rather than 5, and you get an hour to complete it. This is a much more difficult PQ than the Kerning PQ.

To enter the PQ, you must travel to the Eos Tower, found to the left of where you arrive in Ludibrium. The tower has 101 floors and you enter the tower on the 100th floor. Climb up and go through a door to get to the 101st floor. You will find the PQ NPC here; a red stop-sign. You need a party of 6 to enter the PQ. Only 1 party member can die on stages 1 to 8, and the last stage can be finished with no less then 2 people. The party leader must not die at all.

A party of 6, ranging from levels 35 to 50, progresses through 9 stages in less than one hour by solving puzzles and killing monsters. The skills specific character classes possess, such as Haste, Heal, Dark Sight, and Teleport, are eminently used to help pass some of the stages. The skills Dark Sight and Teleport are required to complete the accompaniment. Prizes consist of potions, ores, equipment, scrolls, or summoning bags.

Probably the best party is the following (with all characters 40+):

1 Assassin
1 Cleric
1 Bandit
1 Bowman / Crossbowman
1 Spearman
1 Ice/Lightning Wizard
NOTE
To hit Alishar, the Party Quest boss monster, at least 80% of the time, you will need to have
Level ACC
35 157
40 140
45 124
50 107

Warriors and Thieves at level 40 will typically have about 80 DEX and 140 LUK/STR. Along with a maxed Mastery skill, the accuracy of Warriors would be approximately 84 and thieves 115 (if max nimble body). This means that warriors will almost always miss Alishar and thieves will only hit it about 65% the time. Bowmen at level 40 will have accuracies of around 125. Therefore, it is imperative for any PQ team to have at least 1 bowman that is above level 40, or a higher level assassin because double stab does too little damage without critical, and savage blow will suffer too much weapon defense penalty.

http://strategywiki.org/wiki/MapleStory/Quests/Party_Quests