It's not that difficult to slay Spidey with MAD - the point is to get into her melee range ASAP, using sidestepping and running tactics. You'll take some hits for sure, but with a blue armor (or anything that grants plasma resistance or high protection, for that matter) it's easily survivable. Afterwards it's a piece of cake - her melee attack is extremely weak and she's immune to knockback, so unless she flinches and moves away from you, you're on the safe side of things.
Its true! *Mortem inside tags*--------------------------------------------------------------
DoomRL (0.9.9.7) roguelike post-mortem character dump
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Thomas Parasiuk,
level 12 Mancubus Sergeant Marine,
defeated the Mastermind at the City of Dis.
He survived 104630 turns and scored 111161 points.
He played for 2 hours and 17 minutes.
He didn't like it too rough.
He killed 650 out of 670 hellspawn. (97%)
He held his right to remain violent.
He was an Angel of Shotgunnery!
He saved himself once.
-- Special levels --------------------------------------------
Levels generated : 11
Levels visited : 8
Levels completed : 8
-- Awards ----------------------------------------------------
UAC Star (silver cluster)
Hell Armorer Badge
Hell Champion Medal
Shottyman Bronze Badge
Shottyman Silver Badge
Arachno Bronze Badge
-- Graveyard -------------------------------------------------
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-- Statistics ------------------------------------------------
Health 69/80 Experience 60124/12
ToHit Ranged +0 ToHit Melee +0 ToDmg Ranged +1 ToDmg Melee +1
-- Traits ----------------------------------------------------
Class : Marine
Ironman (Level 2)
Tough as nails (Level 3)
Son of a bitch (Level 1)
Reloader (Level 2)
Badass (Level 2)
Shottyman (Level 1)
Army of the Dead (Level 1)
Rel->Rel->SM->Bad->TaN->MAD->Iro->Iro->Bad->TaN->SoB->TaN->
-- Equipment -------------------------------------------------
[a] [ Armor ] blue armor [2/2] (160%) (B)
[b] [ Weapon ] super shotgun (8d4)x2 [0/2] (B1)
[c] [ Boots ] plasteel boots [2/2] (199%) (B)
[d] [ Prepared ] shell box (x18)
-- Inventory -------------------------------------------------
[a] combat shotgun (8d3) [5/5] (P1)
[b] blue armor [2/2] (100%)
[c] ballistic blue armor [2/2] (58%)
[d] red armor [2/4] (42%)
[e] gothic armor [8/8] (198%) (P)
[f] Medical Powerarmor [4/4] (100%)
[g] shotgun shell (x50)
[h] shotgun shell (x6)
[i] large med-pack
[j] large med-pack
[k] large med-pack
[l] large med-pack
[m] phase device
[n] envirosuit pack
[o] envirosuit pack
[p] lava element
[q] fire skull
[r] tactical boots [0/0] (100%)
[s] shell box (x100)
-- Resistances -----------------------------------------------
Acid - internal 0% torso 0% feet 50%
Fire - internal 0% torso 0% feet 25%
Plasma - internal 0% torso 20% feet 0%
-- Kills -----------------------------------------------------
125 former humans
73 former sergeants
22 former captains
52 imps
50 demons
197 lost souls
24 cacodemons
12 hell knights
16 barons of hell
37 arachnotrons
7 former commandos
14 pain elementals
9 revenants
4 arch-viles
2 bruiser brothers
1 shambler
1 lava elemental
1 agony elemental
1 Cyberdemon
1 Spider Mastermind
1 Arena Master
-- History ---------------------------------------------------
He started his journey on the surface of Phobos.
On level 2 he entered Hell's Arena.
He left the Arena as a champion!
On level 5 he stormed the Chained Court.
On level 5 he found the Arena Master's Staff!
He defeated the Hell Arena Master!
On level 7 he sneaked into the Phobos Lab.
On level 7 he assembled a tactical boots!
He broke through the lab.
On level 8 he encountered the Phobos Anomaly.
On level 8 he assembled a tactical shotgun!
On level 9 he assembled a fireproof boots!
On level 9 he entered Hell's Armory.
On level 9 he assembled a ballistic armor!
On level 9 he assembled a fireproof armor!
He destroyed the evil within and reaped the rewards!
On level 12 he found the City of Skulls.
He wiped out the City of Skulls.
On level 14 he ventured into the Spider's Lair.
He cleared the Lair, kickin' serious spider ass!
On level 16 he found the Tower of Babel!
He flooded the entire level 17 with lava!
On level 19 he entered the Vaults.
He cracked the Vaults and cleared them out!
On level 21 he found the Medical Powerarmor!
On level 22 he entered the Lava Pits.
He managed to clear the Lava Pits completely!
Then at last he found Dis!
On level 24 he finally defeated the Mastermind.
-- Messages --------------------------------------------------
You see : a Spider Mastermind (heavily wounded) | blood | [ m ]ore
The Spider Mastermind flinched! Boom! Boom! Boom! Boom! Boom! Boom!
You quickly reload the super shotgun.
Fire -- Choose target...
You see : a Spider Mastermind (heavily wounded) | blood | [ m ]ore
The Spider Mastermind flinched!
You quickly reload the super shotgun. You are hit!
Fire -- Choose target...
You see : a Spider Mastermind (severely wounded) | floor | [ m ]ore
The Spider Mastermind flinched!
You quickly reload the super shotgun.
Fire -- Choose target...
You see : a Spider Mastermind (mortally wounded) | floor | [ m ]ore
The Spider Mastermind flinched! The Spider Mastermind dies. Congratulations!
You defeated the Spider Mastermind! Press <Enter>...
You feel relatively safe now.
-- General ---------------------------------------------------
38 brave souls have ventured into Phobos:
31 of those were killed.
And 3 couldn't handle the stress and committed a stupid suicide.
4 souls destroyed the Mastermind...
2 sacrificed itself for the good of mankind.
2 killed the bitch and survived.
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Bonus, I had a random name for this doomguy. and its the same name as the last guy who killed mastermind with a shotty.
Why not? Even AoOC with MAD and shotgun possible:
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DoomRL (0.9.9.7) roguelike post-mortem character dump
--------------------------------------------------------------
Phwop, level 6 Cacodemon 2nd Lieutenant Marine,
defeated the Mastermind at the City of Dis.
He survived 24012 turns and scored 29392 points.
He played for 19 minutes and 25 seconds.
He didn't like it too rough.
He killed 132 out of 172 hellspawn. (76%)
He was an Angel of Overconfidence!
-- Special levels --------------------------------------------
Levels generated : 4
Levels visited : 1
Levels completed : 0
-- Awards ----------------------------------------------------
Daredevil Gold Badge
-- Graveyard -------------------------------------------------
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-- Statistics ------------------------------------------------
Health 22/60 Experience 14150/6
ToHit Ranged +0 ToHit Melee +0 ToDmg Ranged +1 ToDmg Melee +1
-- Traits ----------------------------------------------------
Class : Marine
Son of a bitch (Level 1)
Reloader (Level 2)
Badass (Level 1)
Shottyman (Level 1)
Army of the Dead (Level 1)
Rel->Rel->SM->SoB->Bad->MAD->
-- Equipment -------------------------------------------------
[a] [ Armor ] blue armor [2/2] (62%)
[b] [ Weapon ] super shotgun (8d4)x2 [0/2]
[c] [ Boots ] nothing
[d] [ Prepared ] rocket launcher (6d6) [1/1]
-- Inventory -------------------------------------------------
[a] shotgun (9d3) [1/1] (P1)
[b] combat shotgun (7d3) [5/5]
[c] combat pistol (3d3) [15/15]
[d] assault shotgun (7d3) [0/6]
[e] minigun (1d6)x8 [200/200]
[f] nuclear plasma rifle (1d7)x6 [24/24]
[g] blue armor [2/2] (100%)
[h] shotgun shell (x46)
[i] rocket (x2)
[j] rocket (x10)
[k] power cell (x50)
[l] power cell (x50)
[m] small med-pack
[n] large med-pack
[o] phase device
[p] phase device
[q] phase device
[r] homing phase device
[s] envirosuit pack
[t] 10mm ammo chain (x250)
-- Resistances -----------------------------------------------
Bullet - internal 60% torso 60% feet 60%
Melee - internal 60% torso 60% feet 60%
Shrapnel - internal 60% torso 60% feet 60%
Acid - internal 60% torso 60% feet 60%
Fire - internal 60% torso 60% feet 60%
Plasma - internal 60% torso 80% feet 60%
-- Kills -----------------------------------------------------
5 former humans
6 former sergeants
6 former captains
48 imps
21 demons
21 lost souls
7 cacodemons
8 barons of hell
1 former commando
1 pain elemental
2 mancubi
5 arch-viles
1 Spider Mastermind
-- History ---------------------------------------------------
On level 6 he arrived at Mt. Erebus.
He decided it was too dangerous.
Then at last he found Dis!
On level 8 he finally defeated the Mastermind.
-- Messages --------------------------------------------------
The Spider Mastermind flinched! You need to taste blood!
You are hit! You are hit! You are hit! You are hit! You are hit! You need to
taste blood!
The Spider Mastermind flinched! You need to taste blood!
You are hit! You dodge! You are hit! You are hit! You are hit! You are hit!
You need to taste blood!
The Spider Mastermind flinched! The Spider Mastermind flinched! You need to
taste blood!
You need to taste blood!
The Spider Mastermind flinched! The Spider Mastermind flinched! You need to
taste blood!
You dodge! Boom! You are hit! You are hit! You dodge! Boom! You are hit! You
dodge! Boom! You need to taste blood!
The Spider Mastermind dies. Congratulations! You defeated the Spider
Mastermind! Press <Enter>...
You feel relatively safe now.
-- General ---------------------------------------------------
42 brave souls have ventured into Phobos:
31 of those were killed.
4 didn't read the thermonuclear bomb manual.
7 souls destroyed the Mastermind...
1 sacrificed itself for the good of mankind.
4 killed the bitch and survived.
2 showed that it can outsmart Hell itself.
--------------------------------------------------------------
yes, "cornershoot" here near impossible. But with new Mastermind AI when he *flinched* even damageless victory becomes real