Since there is no written guide for my favorite run, gonna put few heads up regarding this run for those interested in trying it out.
Location: Heaven's Lair, end of the 2nd floor (coordinates of NPC: 268.174)
Bonus: Monster / Skill resistance / Block / +20k HP to endure Dragon's attack / +30k damage on Dragon overall
Note: Seems that Dragon doesn't have any weakness except Monster.
Beneficial boosts: Dragon God stuff, Blue liquid, Pink liquid, Red liquid, Palm of pierce, Palm of Critical, Greater healing potions, Buffs of course
Requirement: 15 Dragon God's Symbols. They can be dropped from Zin Heaven General (spawns in a hall where the NPC is - entrance for Aqua Dragon's Room), respawn time: 5-20 minutes
Minimum level: 75
Party: 2-8 players
Only party leader can trigger the run by clicking on NPC Sura Ghost. In order to activate the run, leader must have 15 Dragon God's Symbols in inventory and all party members need to stay nearby.
After activating the run, party gets teleported into the Aqua Dragon room.
Before killing the Aqua Dragon, players must destroy level 60 Metins randomly spawned all over the room.
Monsters spawned from Metins are Heaven's Lair monsters. They can drop Clams, Shields, Boots, Armors, Weapons etc.
Tip: Lure the Dragon to a corner, away from Metins, die and revive. Easier to destroy Metins without Dragon chasing you.
There are several types of Metins and all of them boost Aqua Dragon in a different way:
Metin of Mountain - increases Aqua Dragon's defence
Metin of Arrogance - increases Aqua Dragon's HP regeneration per heal (bigger regeneration)
Metin of Revenge - increases Aqua Dragon's damage
Metin of Solitude - increases Aqua Dragon's HP regeneration rate (faster regeneration)
Depending of players preference, only after 4 Metins of the same type are left, the party should go after the Dragon.
Note: Perfect timing of poisoning the Dragon can be crucial for the run. Players shouldn't use any item with chance to poison, except Green Phoenix Seal (pet).
Usage of Poly Marbles provides faster and easier way to kill the Dragon.
Players automatically get teleported outside the Dragon's room 60 seconds after killing the Dragon. Don't hesitate to pick up the drops.
Cooldown time: 1 hour
Even the run can last up to 1 hour it usually takes only few minutes.
Basically, it is a pretty quick run.
Level, Thief Glove, Item Shop Thief Glove can influence the drop. To increase the chance of full drop players should use normal and item shop Gloves.
Aqua Dragon level: 97
Aqua Dragon drops:
+ Scale of Aqua Dragon (item used to make Quillin/Euphoria/Glory/King Fisher Shoes, Aqua Armors, PVP Weapons level 105 and Belts)
+ Claw of Aqua Dragon (item used to make Quillin/Euphoria/Glory/King Fisher Shoes, Aqua Armors, PVP Weapons level 105 and Belts)
Please note, the ways may differ. I've tried to put all the information that may help players who are new to this run.