I hereby post this GPQ guide. Hope it helps everyone.

Requirements
1) Everyone in the party should be level 70+ for it's easier to boss.
2) One Level 10-30 theres a special area for them. and its better to sacrifice a Level 10-30 than a level 70.
3) One Mage with level 15+ teleport. You can also have a Hermit with Flash Jump, but a mage is still required.
4) One Assassin/Bandit/Hermit/Chief Bandit with maxed haste.
5) An Assassin/Hermit or Ranger/Sniper for some special stages.
6) All have to be in the same guild.

Guild Quest rules
1) In the 3 minutes, if times out without at least 6 people in a party, guild quest'll end.
2) If guildmates die or dc during the quest, everybody can continue before 5 people left.
3) If guildmates die inside the guild quest, he/she can revive at the 1st map and re-enter.
4) 1% exp will be lost if you die inside the quest, even when you take out the earring.

Registration
Go to the Excavation Site in Perion and tell your guild leader or a Jr. Master to talk to Shuang. From there you will be in line to the Guild Quest and you have to wait until you are 0 in line. Everyone that wants to do the Guild Quest should head to the map as soon as they're 1 in line just so you wont miss. You have 3 minutes and if there aren't 6 people in then the next guild in line will go. Once your in, the timer will be on 93:00 or 93:40 you will have to wait 3 minutes to go in and once the 3 minutes pass you will be able to enter the Guild Quest

For more info go see the Forum

Register urself there...

^^