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 DoomRL (0.9.9.7) roguelike post-mortem character dump
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 AAA, level 6 Hell Knight 1st Lieutenant Scout,
 defeated the Mastermind at the City of Dis.
 He survived 27857 turns and scored 80131 points. 
 He played for 18 minutes and 55 seconds. 
 He wasn't afraid to be hurt plenty.
 He killed 131 out of 451 hellspawn. (29%)
 Who gave him the ticket to Hell, anyway?
-- Special levels --------------------------------------------
  Levels generated : 11
  Levels visited   : 1
  Levels completed : 0
-- Awards ----------------------------------------------------
  Mastermind's Brain
  Malicious Knives Cross
  Minor Icarus Cross
  Compet-n Gold Cross
  Strongman Bronze Badge
  Strongman Silver Badge
  Strongman Gold Badge
  Speedrunner Gold Badge
-- Graveyard -------------------------------------------------
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-- Statistics ------------------------------------------------
  Health 70/70   Experience 14669/6
  ToHit Ranged +0  ToHit Melee +4  ToDmg Ranged +0  ToDmg Melee +6
-- Traits ----------------------------------------------------
  Class : Scout
    Ironman          (Level 2)
    Tough as nails   (Level 1)
    Brute            (Level 2)
    Berserker        (Level 1)
  Bru->Bru->Ber->Iro->TaN->Iro->
-- Equipment -------------------------------------------------
    [a] [ Armor      ]   blue armor [2/2] (192%) (B)
    [b] [ Weapon     ]   chainsword (8d2)
    [c] [ Boots      ]   nothing
    [d] [ Prepared   ]   combat knife (2d5)
-- Inventory -------------------------------------------------
    [a] pistol (2d4) [6/6]
    [b] 10mm ammo (x20)
    [c] small med-pack
    [d] large med-pack
    [e] large med-pack
    [f] large med-pack
    [g] large med-pack
    [h] large med-pack
    [i] large med-pack
-- 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 -----------------------------------------------------
    21 former humans
    17 former sergeants
    9 former captains
    22 imps
    15 demons
    22 lost souls
    5 cacodemons
    2 hell knights
    5 barons of hell
    2 arachnotrons
    1 former commando
    2 revenants
    4 arch-viles
    2 bruiser brothers
    1 Cyberdemon
    1 Spider Mastermind
-- History ---------------------------------------------------
  He started his journey on the surface of Phobos.
  On level 5 he stormed the Chained Court.
  He left level 7 as soon as possible.
  On level 8 he encountered the Phobos Anomaly.
  On level 16 he found the Tower of Babel!
  He left level 16 as soon as possible.
  Level 19 was a hard nut to crack!
  On level 20 he assembled a chainsword!
  He sounded the alarm on level 21!
  He left level 22 as soon as possible.
  Then at last he found Dis!
  On level 24 he finally defeated the Mastermind.
-- Messages -------------------------------------------------- 
 berserk! You need to taste blood! 
 You hit the Spider Mastermind. 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! 
 You hit the Spider Mastermind. The Spider Mastermind flinched! You need to 
 taste blood! 
 You hit the Spider Mastermind. The Spider Mastermind flinched! You need to 
 taste blood! 
 You are hit! You are hit! You are hit! You are hit! You are hit! Boom! You 
 need to taste blood! 
 You hit the Spider Mastermind. The Spider Mastermind flinched! You're going 
 berserk! You need to taste blood! 
 You hit the Spider Mastermind. The Spider Mastermind dies. Congratulations! 
 You defeated the Spider Mastermind! Press <Enter>... 
 You feel relatively safe now. 
-- General --------------------------------------------------- 
 204 brave souls have ventured into Phobos:
 187 of those were killed.
 5 didn't read the thermonuclear bomb manual.
 And 2 couldn't handle the stress and committed a stupid suicide.
 10 souls destroyed the Mastermind...
 10 killed the bitch and survived.
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I don't normally play HMP, but I wanted a gold badge for next rank, and I saw this one. I figured that melee stairdiving can't be that much harder knives-only, so I went for it. It took a night or so of attempts, but here it is.
There really wasn't any strategy to this aside from lucky invulns and punching things.