Deeper Fibula Quest/Spoiler

===Required equipment===
* Key 3940
* Key 3980
* Destroy Field runes (or use Browse Field)
===Method===
*Head to Fibula and enter the dungeon through the well.
*Follow the path shown on the map. If you are faced with a locked door, you need Key 3940 to open, it can be bought on the island.
*Upon coming down, head east and through a teleporter.
*You will now be facing two teleporters, go through the level 50 gate of expertise and the right one.
*You will be teleported to a room with 2 Minotaur Guards and 4 Minotaur Archers.
*Continue west through fire, and energy fields to get Key 3980, be prepared to face 3 Minotaur Mages.
*Key 3980 is found by "using" on a hole to the west (marked on the map).
*Go back and then south, kill some Minotaurs (normal and archers if you go east, or normal and mages if you go west), unlock the door with you newly found key, and in the next room, prepare to face much Minotaurs of all sorts.
*Continue further and now prepare to face ~16 Dragons and 4 Dragon Lords (one at the entrance of the cave, three at the exit).
*The quest rewards are found in scattered human and skeleton corpses at the end of the cave. Note that some corpses may require you to manually open them, since Tibia may attempt to Quick Loot the corpses instead of opening them depending on what controls you use. 
** Tower Shield is in the north-west corner of the cave, under a Fire Field, inside a skeleton. If you don't have any Destroy Field runes, you can use Browse Field on the Fire Field to open the skeleton.
** Warrior Helmet is south of the Tower Shield, in a skeleton that is hidden behind a rock.
** Dwarven Ring is north of the exit portal, inside a skeleton.
** Elven Amulet is directly east of the Dwarven Ring, in a fresh-looking dragon corpse.
** Knight Axe is south-east of the Elven Amulet, in a dead human body.
*The portal in the south-west part of the last room leads back to the dungeon entrance.
Note: It is possible to get the Tower Shield and Knight Axe without using Destroy Field. Simply lure the Dragon Lord and have him make a Fire Bomb over the existing Fire Field. It will go away in a few minutes.