I indeed had overlooked the flash spell earlier, so I tried it out. The flash spell is quite rare, but Adria sells it and Adria also restocks when saving and loading (like in the original diablo), so no problem there. The lava lords are immune to magic, so no luck there, but they go down quickly to the golem. However the flayed ones, which were the major pain in the ass before, are merely resistant to magic and so can be killed with flash. At the end they went down after about three casts of flash. I included a screenshot of the spellbook at the end of the game, so you can see that at higher levels flash does quite decent damage (about on par with fireball). It also is not too expensive.
Many thanks for the hint!
Mortem spoilered because of length.
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DiabloRL v 0.5.0 roguelike postmortem character dump
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momo, level 22 Sorcerer, reached Hell.
He scored 565426.106 points, killing 0 hellspawn.
He advanced to level 22 gaining 2229646 experience.
He amassed 48259 gold coins.
He killed the Butcher.
He purified the town water supply.
He was patient with Gharbad the Weak.
He uncovered the Arkaine's Valor.
He learned the Guardian spell.
He cleared Halls of Blind.
He interrupted Zhar the Mad's studies.
He was a sage. (+10%)
He was a hypohondriac.
-- Statistics ------------------------------------------------
Strength 28/20
Magic 187/137
Dexterity 25/17
Vitality 41/22
Life 82/82 Mana 416/387
Armor 34 ToHit 62
-- Spells ----------------------------------------------------
Firebolt level 15
Holy Bolt level 13
Healing level 14
Town Portal level 3
Flash level 10
Stone Curse level 2
Phasing level 2
Mana Shield level 4
Fireball level 8
Guardian level 2
Golem level 5
Teleport level 1
-- Equipment -------------------------------------------------
[ Head ] crown of Brilliance [14]
[ Neck ] amulet of the Stars
[ Body ] Amber armor of Brilliance [14]
[ Wpn ] mace of Brilliance (1-7)
[ Shld ] Pearl buckler of Blocking [6]
[ RRng ] Ring of Truth
[ LRng ] ring of Vim
-- Quickslots ------------------------------------------------
[ Slot1 ] scroll of mana shield
[ Slot2 ] potion of full rejuvenation
[ Slot3 ] potion of full rejuvenation
[ Slot4 ] potion of full rejuvenation
[ Slot5 ] potion of full rejuvenation
[ Slot6 ] potion of full rejuvenation
[ Slot7 ] potion of full rejuvenation
[ Slot8 ] potion of full rejuvenation
-- Inventory -------------------------------------------------
48259 gold coins
Optic amulet
Blackoak Shield [18]
mail of Sorcery [34]
Brutal sword of Swiftness (2-6)
Serpent's war staff of Swiftness (8-16)
small axe of Slaying (2-10)
mail of the Stars [17]
-- Kills -----------------------------------------------------
Rotfeast the Hungry
Soulpus
Bongo
Shadowdrinker
Foulwing
Blighthorn Steelmace
Bloodskin Darkbow
Breakspine
the Butcher
Gharbad
Zhar the mad
65 * zombie
26 * ghoul
88 * rotting carcass
25 * skeleton
28 * corpse axe
33 * burning dead
98 * horror
11 * skeleton captain
87 * horror captain
45 * burning dead archer
61 * scavenger
52 * plague eater
48 * shadow beast
125 * bone gasher
39 * fallen one
43 * fallen one
18 * carver
67 * devil kin
6 * dark one
34 * blink
81 * gloom
74 * familiar
3 * flesh clan
70 * stone clan
67 * fire clan
140 * night clan
83 * flesh clan archer
66 * hidden
13 * unseen
53 * overlord
262 * flayed one
20 * horned demon
200 * mud runner
85 * obsidian lord
203 * lava lord
48 * winged demon
69 * gargoyle
90 * acid beast
254 * pit beast
-- Messages --------------------------------------------------
A amulet of Power is lying here.
"I can't carry any more" A amulet of Power is lying here.
Unknown command. Press Escape for menu and help file! A amulet of Power is
lying here.
You drop 5000 gold coins. A amulet of Power is lying here.
You put the amulet of Power into your backpack.
Griswold says : "What can I do for you?"
You sold a amulet of Power for 1900 gold pieces.
A pile of 5000 gold coins is lying here.
You got 5000 gold coins.
Griswold says : "What can I do for you?"
Griswold repaired Amber armor of Brilliance for 155 gold pieces.
Griswold repaired Blackoak Shield for 300 gold pieces.
Griswold repaired mail of Sorcery for 1167 gold pieces.
Griswold repaired Brutal sword of Swiftness for 324 gold pieces.
Griswold repaired Serpent's war staff of Swiftness for 2211 gold pieces.
Griswold repaired small axe of Slaying for 239 gold pieces.
Griswold repaired mail of the Stars for 2345 gold pieces.
You feel yanked in a direction that never existed! Press < Enter >...
Congratulations! You have won the Demo version! Press < Enter >...
--------------------------------------------------------------
Press <Enter> to view, <Escape> to exit...
You got 164 gold coins.
..:....:.## ######ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ Spells ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
..:....:..## ##.#...³ ³
..:....:...##### #.....#³ Firebolt (L:15) 33-42 Cost: 3 ³
%.::::::.......### ##..#...³ Holy Bolt (L:13) 31-40 Cost: 3 ³
.................## ##..##...³ Healing (L:14) 37-182 Cost: 10 ³
...##..::::::..%..# #...#....³ Town Portal (L:3) Cost: 29 ³
######.:....:..%..### ##...#...#³ Flash (L:10) 107-214 Cost: 16³
#..:....:.....%.###########........#³ Stone Curse (L:2) Cost: 57 ³
##.::::+:.......................%...³ Phasing (L:2) Cost: 10 ³
#...............########.##....%%...³ Mana Shield (L:4) Cost: 33 ³
#####.þ...#####....## ####.%þ.%.%..³ Fireball (L:8) 123-215 Cost: 10 ³
.##.....#.# #....## #.%........³ Guardian (L:2) Cost: 48 ³
........### ####..### ##..##.....³ Golem (L:5) Cost: 76 ³
::::':::## #...@..## #..####....³ Teleport (L:1) Cost: 35 ³
.........# #.......# #.%.###....³ Close ³
#........# ####......#######....##....³ ³
###......#####.......####....#...###....³ ³
##.......##.#####.#### # #....## #....³ ³
#..........## ##### #. ##....###....³ ³
##..........# #..# #..#..%...#....=³ ³
..........%.# #.## #..........==.=³ ³
#####..##...### #.#### ###..=======..=³ ³
######%...# #.##.# #####%==========³ ³
##..#####....# #......%========³ ³
### ##....#......###.....%.........³ ³
##.## ####..=....====......%.%#...#%....³ ³
....# #.....========.........##.%###....³ ³
::':#######..=.===.....%%....##.## #....ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ....ÄÄÄÙ
---######- [?!!!!!!!] ------------------------------ Caves, level 12 --......---
###### Fireball ######
#### ####