Stage 5: Fluttering Hearts

This stage is rather confusing and has a very intense feeling to it. After passing through Stage 4's gate, it has suddenly become night time, and dozens of monsters have begun pouring out. First come Skeledogs, Dirty Ratz, and Wraiths capable of flight. Players must hit the gate with their regular attacks to bust it open in time, before an army of angry Rombots come and destroy them. These Rombots are not the pushovers found in Eos Tower or Ludibrium PQ; They can inflict 10,000 touch damage. Open the gate quickly by having each member of the party hit the gate, and run toward the exit. After the first gate, lava plumes begin to appear, which can deal about 300 damage each. These aren't much of a threat, nor do they slow down the PQ very much. However, mages will need to be careful as Magic Guard doesn't protect from environmental damage. Everyone must survive this stage to progress on.

This stage awards 9000 EXP upon completion.
http://strategywiki.org/wiki/MapleStory/Quests/Party_Quests