First: I love healers. They are the perfect warrior-spellcaster hybrids because of their high To and both the find weakness and the concentration skill. You have to go to the rift to find any spellbooks, but they heal so quickly that you won't have any trouble casting from HP later on. This is why new players (like me) should play healers to be able to survive the early game and dabble in magic later to take on tough monsters such as the orb guardians. In fact, I barely used melee attacks at all on D:50 to be able to stay in coward mode.

I sure hope I will cut back on my ADOM-playing from now on - this game is a bit too addictive to allow a normal life.
I started this healer by going through the UD and found a stomafillia patch two levels above a neutral altar, which allowed me to get the robes of resistance (great, more toughness) and preserver (which did wonders for my spellcasting later) as crowning and postcrowning gifts respectively.
Sadly, there were no Artifacts generated in the casino (maybe I just missed them), but I accidentally stepped out of the gift shop, which angered the guards and the shopkeeper, but I was able to brutally murder them with my extraordinary toughness and some well-placed acid balls.
After then doing many other unremarkable thing, such as being nearly slain by battle bunnies (I managed to lock them in, or rather myself) and the cat lord (which, thankfully, can't break doors), I stumbled through the various elemental temples (the Mana Temple of course being the worst), I found D:50. Ohh boy. Balors do really hit hard and often. And this doesn't say anything about their corruption attack. after I had disposed of them and their chaos servant/mutant friends, I had no Acid Ball castings anymore; instead, I was down to 15 corruptions. This didn't hurt me as much as the speed reduction from D:49, which I could not reverse except by potions of boost speed. After I tried to kill the ghost lords in the central room and got aged to 82 years (still thankful for the blessed potions of longevity I had drunk), I had the great idea to just lock them in. Thus, I could handle the levers and finally close the chaos gate.

As for drakelings: their acid spit is very useful against karmic lizards in the early game as well as for losing the bloated status for eating stat-increasing corpses. The speed reduction on D:50 is steep though. I like them anyway.
Healers are great for HP casting - I had to drink only one potion of extra healing on D:50.

Well, here is the abridged victory file:
Code:
------------------------------------------------------------------------------

Zujju         St:22  Le:27  Wi:31  Dx:21  To:43  Ch:11  Ap: 7  Ma:18  Pe:12 N-
DV/PV: 68/41   H: 949(949)    P: 361(361)    Exp: 50/32771860   DrCh  Sp: 101
Blessed Bloated
------------------------------------------------------------------------------


----------------------------------------------------------------------------
                            Background Information
----------------------------------------------------------------------------

Name: Zujju               Race: male Drakeling      Class: Healer
Eye color: light blue     Hair color: bald          Complexion: green
Height: 5'8"              Weight: 158 pounds        Scars: 1
Age: 82 (very old, 57 years of unnatural aging added in)
Star sign: Cup            Birthday: 29/Cup (day 269 of the year)

YOUR HISTORY:
        Your parents belong to the lower class. They were honest
 hard-working people, who did everything to enable you to live a
 comfortable and fine life. They were not very successful.
        As a child your parents cared a lot for you. Despite all
 circumstances you enjoyed a happy and fine childhood.
        As a kid you often watched the adult adventurers preparing for new
 exciting journeys. They sparked your imagination.
        Your life as a young adult was characterized by steady
 determination. Your goal lay clearly ahead of you and you never strayed
 from your path.
        You decided to become a Healer.


----------------------------------------------------------------------------
                                  Inventory
----------------------------------------------------------------------------
Total weight: 8375 stones                Carrying capacity: 35521 stones

Head          : uncursed eternium cap (+1, +1) [+0, +3]               [28s]
Neck          : blessed sapphire amulet "Preserver" [+4, +4] {Wi+7}    [3s]
Body          : blessed robes of resistance (-4, -4) [+3, +12] {To+5} [60s]
Girdle        : uncursed girdle of strength [+0, +0] {St+4}           [15s]
Cloak         : blessed cloak of defense [+3, +0]                     [20s]
Right Hand    : uncursed scorched spear (+2, 3d8+1) [+2, +0]          [50s]
Left Hand     : uncursed large adamantium shield [+9, +5]             [86s]
Right Ring    : blessed ring of slaying (+9 melee damage, +6 missile damage)
Left Ring     : uncursed ring of mental stability [+0, +1] {Le+4}      [1s]
Bracers       : uncursed rusty bracers of speed [+0, +0] (+4 spd)     [10s]
Gauntlets     : blessed elemental gauntlets (-1, +0) [+0, +3]         [10s]
Boots         : uncursed boots of sneakiness [+0, +0] {Dx+2}          [20s]
Missile weapon: -
Missiles      : heap of 11 uncursed sis                              [110s] (for D:49)
Tool          : blessed stethoscope                                    [5s]


----------------------------------------------------------------------------
                                    Stuff
----------------------------------------------------------------------------

Total weight: 7956 stones   Carrying capacity: 35521 stones

Helmets ('[')
   uncursed mithril cap [+0, +2]                                      [40s]
   blessed helm of beauty [+0, +0] {Ap+1}                             [50s]
Armor ('[')
   uncursed ancient mummy wrapping [+1, +5] {Ap-8}                    [60s]
   blessed black dragon scale mail (-2, -4) [-2, +11]                [200s] (these were used when encountering dragons)
   uncursed crystal scale mail (+0, -1) [+0, +8]                     [620s]
   uncursed empowered mithril ring mail (-1, -1) [-1, +5]            [240s]
   uncursed yellow robe [+0, +2]                                      [60s]
   blessed blue dragon scale mail (-1, -4) [-1, +10]                 [200s]
Shields ('[')
   uncursed large crystal shield (-1) [+12, +2]                      [210s]
Cloaks ('[')
   uncursed cloak of invisibility (-1, +0) [+3, +0]                   [30s] (extremely helpful in pyramid and Air temple)
   uncursed cloak of defense [+3, +0]                                 [20s]
Girdles ('[')
   heap of 2 uncursed mithril girdles [+0, +2]                        [40s]
   uncursed girdle of greed [+2, +0]                                   [7s]
   uncursed girdle of strength [+0, +0] {St+2}                        [15s]
   uncursed adamantium girdle [+0, +3]                                [18s]
   heap of 2 uncursed girdles of carrying [+0, +0]                    [30s]
   uncursed eternium girdle [+0, +4]                                  [12s]
Boots ('[')
   uncursed eternium boots [+0, +5]                                   [55s]
   uncursed boots of speed [+2, +1] (+8 spd)                          [20s]
   uncursed mithril boots [+1, +2]                                    [96s]
Necklaces (''') (these were all useless after I  got preserver; and most got found after that)
   uncursed necklace of the eye                                        [3s]
   blessed amulet of balance                                           [3s]
   uncursed amulet of death ray resistance                             [7s]
   uncursed amulet of petrification resistance                         [3s]
   uncursed ankh                                                       [3s]
   uncursed black torc [+4, +2] (+10 spd)                              [3s]
   blessed necklace of the eye                                         [3s]
   uncursed amulet of protection from constructs                       [3s]
   uncursed amulet of light                                            [3s]
   uncursed amulet of perseverance {Wi+3}                              [3s]
   uncursed amulet of speed (+3 spd)                                   [3s]
   uncursed amulet of speed (+3 spd)                                   [3s]
   uncursed amulet of balance                                          [3s]
   uncursed amulet of greed                                            [3s]
   uncursed brass amulet                                               [3s]
   cursed amulet of protection +2                                      [3s]
   cursed necklace of rabies resistance                                [2s]
   uncursed amulet of health                                           [3s]
Bracers (',')
   uncursed brass bracers [+0, +0]                                    [10s]
   uncursed bracers of toughness [+0, +0] {To+6}                      [10s]