HellQuest (by Mortalengine)

Starting HellQuest the old school way:
Buy the key from Tykier (Key to the Vestibule of Hell), who wanders around major Medievia cities. Go to an infernal machine in Txiki Ardi (recall, 2N, E) and type “turn machine on zoripadeetaohak.” You will be transported to the Hellquest (@).

Starting HellQuest the new (easy) way:
Go the Quest Shop in Medievia City (recall, enter warrior, 4N, 2E, S) and buy the key to HellQuest (Key to the Vestibule of Hell) from Golem. Go U, W, N, enter portal, and S to @.

Things to know before running this quest:
* Read HellQuest help file as it has useful information.
* HellQuest has recall at @. You can word when things get rough. If you die, then you can unkey (returns all keys to the recall including Minnos’s blood skin).
* All keys have multiple uses. If the zone resets on you, then you do not need to kill boss mobs. Just use the keys to unlock doors as there are no blockers.
* The biggest pain of running HellQuest is the abundance of regular mobs on each level. They load everywhere and can fuck up things quickly. I usually isolate (trap/lure/shield) boss mobs, when possible, and hit them. 
* You can move elementals between different levels.

Walkthrough with Maps:

Level 1
Mobs: Damned Souls
Boss: Charon
     
This is a very easy level. Kill Charon for the key and search at 1 (huge key) to unlock hidden exit.
                      
 @                            Legend: -- locked exits
  \                                    @ zone entrance/recall                                                       
   o o              
    \|                                       
     1--o --> to level 2                       
     |              
     o              

Charon (a huge key) 
Charon, a mage with perma fireshield, wanders around. 

Level 2
Mobs: Pagans 
Bosses: Aeni and Electra

Another easy level. Kill Aeni and Electra for the keys to unlock hidden exits at 2 (a tiny key) and 3 (key to the Citadel).

   o--o--o--o--o--o             Legend: -- locked exits
   |  |  v  |  |  |                     -- illusionary/hidden exits
   o--o--o<<o<<o--o                     >> one-way exits         
   |  |  |  |  ^  ^
1--o--o<<o--2--o>>3                          
   |  |  |  |  v  v\                         
   o--o--o--o<<o--o 4 --> to level 3              
   |  |  |  ^  |  |
   o<<o--o--o--o--o

Aeni (a tiny key)
Aeni, a warrior with perma sanc, wanders around.

Electra (Key to the Citadel)
Electra, a mage with perma fireshield, wanders around. 

Level 3
Mobs: Carnals
Bosses: Minos and Helen

Things start getting harder on this level. Kill Minos at 4 for Minos’s bloody skin. Only the person who wears Minos’s bloody skin can move freely on this level. The east side of this level is LPK and you can summon the form there (5 is usually free of mobs). This is also a great phase point if you have someone who can AFK. Find Helen and ice her for the key, then search at 5 (a winged shaped key) to unlock hidden exit.  

  o--o--o--o--o--5               Legend: -- locked exits             
  |  |  |  |  |   \                     
3 o  o  o--o  o--o o --> to level 4                         
 \|  |  |     |  |                      
  4--o--o  o--o--o                     
  |  |  |  |     |                        
  o--o--o--o--o--o                     
  |  |  |  |  |  |                    
  o--o--o  o--o--o                      

Minos (Minos’s bloody skin)
Minos, a mage with perma fireshield, doesn’t move and is !melee. Dis carnals and tremor/acid until all is dead.

Helen (a winged shaped key) 
Helen, a cleric, wanders around. Trap her, shield room, summon form and alt-bash (she fully dispels) until dead. 

Level 4 
Mobs: Gluttons
Bosses: Cerberus and Ciacco

This level is loaded with a ton of aggressive mobs and several cold rooms. Find and kill Cerberus and Ciacco. Cerberus has a scroll needed on level 6. Ciacco has the key that unlock hidden exit at 6.

  o--o--o  o--o  o        Legend: -- locked exits
  |     |     |  |          
5 o--o  o--o--o--o
 \|  |  |     |    
  o--o--o  o--o
  |     |  |  |
  o--o  o--o  o--o
  |  |  |     |  |
  o--o--o  o--o--6
                  \
                   7 --> to level 5

Cerberus (a brown scroll)
Cerberus, a mage with perma fireshield, wanders around. 

Ciacco (a piece of Offal) - Cleric (full dispels)
Ciacco, a cleric, wanders around. Trap, lure, and alt-bash (he fully dispels) until dead.

Level 5 
Mobs: Hoarders and Wasters
Bosses: Plutus

The are two keys you need to get on this level. A Waster’s boulder that loads on Plutus and a Hoarder’s boulder that loads on a random Hoarder. The boulders weigh 240 stones each! Search with a Hoarder’s boulder at 8 to unlocks hidden exit. A Waster’s boulder unlocks door to the last mob. Last but not least, Wasters can be killed with one melee while Hoarders are a pain in the butt.

            o--o--o--o--o        Legend: -- locked exits
            |  |  |  |  |                >> one-way exits
         6  o--o--o--o--o
          \ |  |  |  |  |  
            7--o--o--o<<8--o --> to level 6
            |  |  |  |  V  
            o--o--o--o--o         
            |  |  |  |  |           
            o--o--o--o--o         

Plutus (a Waster’s boulder)
Loads at 7 and doesn’t move. Shield room, lure mobs away, and ice. 

A Hoarder (a Hoader’s boulder)
Find a Hoarder with a boulder. Trap, lure, and ice for the key.
A Hoarder’s boulder unlocks door to the last mob.

Level 6
Mobs: Wraithful and Sullens
Bosses: Phlegyas and Fillipo Argenti

Level 6 procs massive damage when you type anything:
A mangled humanoid arm reaches out of the muck and grabs your ankle, pulling you under!
You have been KILLED!!
Remember the scroll from Cerberus? Have scroll in inventory and type recite scroll:
You hear a gurgling sound and the ground begins to steam and convulse... The entire swamp has turned to hard rock.
Now you are back in business. There are two boss mobs, Phlegyas and Fillipo Argenti. One of them loads a red key. First check Phlegyas. If it doesn’t load the key, then move onto Fillipo Argenti. You will need a Hoarder’s boulder from level 5 to open the door to Fillipo Argenti at 9. 

        o--o--o--o--o       Legend: -- locked exits
        |  |  |  |  |
        o--o--o--o--o
        |  |  |  |  |
     o--8--o--o--o--o--9--o --> Level 7 (Trophy Room)
        |  |  |  |  |
        o--o--o--o--o
        |  |  |  |  |
        o--o--o--o--o

Phlegyas (a red key - 50% chance)
Trap, lure, and ice for the key.

Filippo Argenti (a red key - 50% chance) 
Fillipo Argenti (!melee) loads with rebellious angels. Clear the room west of 9 and trap it. Lure Fillipo Argenti out.

Level 7 - Prize room

9--o

Inside The Gates Of Dis (End Round 1/5)
The great walls of the iron city block the way to Lower Hell. Properly speaking, all the rest of Hell lies within the city walls, which separate the Upper and Lower Hells. Having defeated the Rebellious Angels, you are now free to travel farther into Hell, to the Sixth Circle. On the wall, a glowing scroll is posted, commemorating the victories of the heroes who have successfully
ventured this far.
Type GET TROPHY to gain you award and leave the zone.

get trophy
You find a Hell quest trophy in your inventory.

NOTICE: You are leaving a PLAYER KILLING area.
You disappear into the darkness and find yourself elsewhere.

Object: a Hell quest trophy [trophy hell quest hellquest]
Item Type: TREASURE   Effects: PRESENT QPRIZE  NO-LOCKER 
Equipable Location(s): TAKE HOLD 
Weight: 0     Value: 100000     Level Restriction: 0
This object has been blessed by the Gods and seems indestructible.
Days Left: Infinity

Object: a medal for finishing Hell Quest [medal hellquest]
Item Type: MEDAL   Effects: NO_RENT NO_RELOAD 
Equipable Location(s): TAKE 
Weight: 0     Value: 1     Level Restriction: 0
The object appears to be in perfect pristine condition.
Days Left: 185

Medal is not auto. Ask god for a medal?

Hellquest done on 4/5 with Zephyrion, Yuer, Malaki, Qiurmus, Mortalengine, Zultic, Kea, Rzael, Jyl, and Elsen.