[My Source: http://forum.ogplanet.com/forum_posts.asp?TID=28253 USA version]

[His Source: http://forum.playpark.vn/showthread.php?t=19738 Vietnamese version, going to attempt to translate this]

Dungeon Name: Forgotten Temple
Requirements: lvl 115 and Muster Card: Forgotten Temple - B1F
Duration: 50 min
Note: Dungeon mobs won't respawn in this dungeon
And you should take 1kk with you because later in the dungeon you need to
buy an Epaulette.



The Entrance of the dungeon is in Forgotten Ruin a lvl 95 area.




1. Press on the hour glass to turn off the fire wall



2. As you step up the stairs on the left there is a figure you can click on.



3. Keep going forward, you will meet a wall of fire that is blocking a bridge. Just wait until it goes down and pass by. Then keep moving forward until you cannot go forward anymore. Click on the monument on the left.



4. Keep moving forward. Press on this next monument
(You don't realy need to kill those mobs which are in the room but i would advise you to do it because a key or a mutant engery ball could drop)



5. This next part. You should move to one side (to the right or left monument, then just one monument will shoot on you) and attack with ranged skills. You will need to break down the wall of fire while being shot at by monuments on the sides. Otherwise if you have to low defence you need to go in Bm or Aura.





After you destroy the wall of fire. Keep moving forward and kill the Obidiant to continue with the quest. These mobs have high def and can melee/range; however, their atk rate arent that great.



After you kill all the Obidiant. Go forward until u get to the next wall of fire. Click on the snake monument on the right to advance ur quest and teleport in. Note: each member has to click on the right monument to teleport in. Don't try to run pass the wall of fire it wont happen ^^



In the next room, you have to kill the mini boss - Nesbite. At the same time in each corner of the room, there will be a Serpent that spawn. You will have about 5 seconds to kill the serpent, or it will activate the laser and most likely 1 hit you. The serpent spawn goes in clockwise manner. So you dont have to guess where he will spawn next. If you are solo-ing you can drag the boss around clockwise. If you are in a party you can drag him or have 1-2 people work clockwise to kill the serpent.



After you kill the boss. Click on the altar in the middle of the room to open the way to the next hallway. Go forward and clear the hallway to get quest items.



Once you get to the end of the hallway look on the left side there is a beetle box. Break it to get the Mutant Record. Note: each member in the party needs one.



After you get ur mutant record work ur way backward. Talk to the monument on 2nd picture to open a door. Talk to the researcher behind the door. Pay him 1 mil and get the Epaulette +300 Hps and +500 def.





Once you get your Epaulette. Go back and into the room to kill all the mobs that will spawn (you need to click on the machine at the first Screenshoot, then they will appear). Occasionally click on the wall of fires to try to break them. Break them when you can.





After you can go into the next room. Make sure you have at least 2 SP bars (if not 3). This next boss requires u to kill him in certain amount of time or he will fully regenerate. He will also turn on a shield occasionally. Once he turns on his shield, get off the platform to the stairs. Kill all the mobs that respawn at the stairs and then attack the boss again. Just keep doing that back and forth, and he should die. Furthermore, once his shield is turned on, the faster you kill the guards, the more time you will have to hit the boss before the shield goes back up



Here's possible position for people to stand while fighting the boss.



If you solo chakris make sure you do it with this little trick:

Cabal How to: Kill Chakris (Forgotten Temple Boss)

After you kill the boss, take off the Purify Epaulette and use ur A.C. Transmutter to break it to get a quest item. Talk to the stone behind where the boss stood to teleport you to the next room.



This long hallway has fire cannons that will shoot at you while you run by. With a defense of 800-900, they will hit you for about 200-300. If you need to, you might want to turn on BM and/or aura to run by. Once you get to the end of the hallway, you will need to break a wall of fire down to go into the next room (while being shot at by the cannons)



Once you get into the next room. Find a corner to get all of your party gather there. All those stone monuments mobs will spawn in different batch and just clear the room.



After the room is clear go into the next hallway and kill all the Groga



Once you clear the Groga, you can enter the next hallway to the last boss' room. Make you have enough SP (2 maybe 3) before going in. If you click on the statue on the Groga picture a timer will run and u have a certain time to come near the Fire wall befor the boss room..after some seconds the wall will open and you need to dash inside fast or it will be closed again and u need to destroy it.
The last boss you have couple minutes to kill him. If you don't kill him, he will disappear and a bunch of mobs will spawn. Once the boss respawn, the boss will get stronger. The boss will get stronger by each respawn.




After you kill the boss, there is an altar at the back of the room. When you click it the dungeon will be over and you will be teleported back out. Make sure you get ur chests (if u have picked up keys along the way). There are 3 possible keys (red, blue, green). Each key has a different serie of box to click before u can open the chest room. The location of the chest room is between the Mutant Record and Researcher.

Key Quest:

To start the hidden key quest you need to obtain one key.
There are 3 kinds of keys:
- Mutant Key Red
- Mutant Key Green
- Mutant Key Blue

Those keys are drops from monsters inside FT, every normal monster can drop it.
Sometimes no key will drop and sometimes you will get more than one (depend only on luck). The best way is to kill all monsters in the whole dungeon.

Now after you got a key you need to find the correct boxes.
You need to talk with 3 of them and then you get the Treasure key.

Mutant Key Red:

- First you need to click on the box which is at the beginning (Entrance).
- Next box is in the tunnel after the Nebsite room.
- Last box is in the Nebsite room.

Mutant Key Green:

- First box is in the tunnel after Chakris (second boss, the cat).
- Second box is befor you enter the room with the fire wall and those shooting
statues.
- Last box is in the room befor Chakris.

Mutant Key Blue:

- First box is in the tunnel befor the last boss room (After the Golem room).
- Second box is in the room befor Chakris.
- Last box is in the Golem room.

The Treasure Guardian (the room with your 4 chests) is in the tunnel between the Nebsite room and the Mutant Record Statue.




Notes:

- You can only do one key per FT run.
- It is not important which key you take, drops will be the same.
- Easiest Key for solo runs is the red one because you must not kill Chakris for the
boxes.

Official confirmation from Estsoft:

If you get a Mutant energy ball from a monster and you want to craft Mithril then you need to run back to the place where you picked up the Record of the Mutant.
Across from this point will be the hidden NPC.
Talk with him and give him his ball back and the wall on the left side will disappear.
Now you can walk inside and choose the card you want (sloted Mithril).



Tipp:
Read the guide about Mithril befor: Mithril Item description by [GM]Arwen

FT Map:

by Trancid

If some one wants to add in more just let me know and i'll edit.

Credits:

wandering862 (he translated the guide)

Arwen (She made the Mithril Item description)

Trancid (For his wonderfull map)

Att4xx (For his great chakris time attack video)