I just checked my mortems and this was my 90th attempt in the past 3 months :-) I've been after this badge for years (since 2013 when I got the Marksman Platinum for the first time). It's quite a relief to finally get it and the icing on the cake: I have a recording of the run for posterity!
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DoomRL (0.9.9.7) roguelike post-mortem character dump
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Ilya Bely, level 14 Arch-Vile Lt. General Technician,
defeated the Mastermind at the City of Dis.
He survived 288905 turns and scored 544114 points.
He played for 2 hours, 37 minutes and 53 seconds.
He opposed the Nightmare!
He killed 755 out of 932 hellspawn. (81%)
He was an Angel of Marksmanship!
-- Special levels --------------------------------------------
Levels generated : 11
Levels visited : 3
Levels completed : 1
-- Awards ----------------------------------------------------
Mastermind's Brain
UAC Star (bronze cluster)
Marksman Diamond Badge
-- Graveyard -------------------------------------------------
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-- Statistics ------------------------------------------------
Health 50/50 Experience 81648/14
ToHit Ranged +6 ToHit Melee +6 ToDmg Ranged +0 ToDmg Melee +0
-- Traits ----------------------------------------------------
Class : Technician
Hellrunner (Level 3)
Son of a gun (Level 5)
Eagle Eye (Level 3)
Intuition (Level 2)
Sharpshooter (Level 1)
SoG->SoG->SoG->EE->EE->EE->MSs->Int->Int->HR->HR->SoG->SoG->HR->
-- Equipment -------------------------------------------------
[a] [ Armor ] red armor [4/4] (100%)
[b] [ Weapon ] high power pistol (2d6) [3/4]
[c] [ Boots ] tactical boots [0/0] (100%)
[d] [ Prepared ] blaster (2d5) [10/10] (P1)
-- Inventory -------------------------------------------------
[a] pistol (2d4) [6/6] (T1)
[b] nanofiber red armor [2]
[c] 10mm ammo (x100)
[d] 10mm ammo (x100)
[e] 10mm ammo (x100)
[f] 10mm ammo (x100)
[g] 10mm ammo (x100)
[h] 10mm ammo (x100)
[i] 10mm ammo (x19)
[j] small med-pack
[k] large med-pack
[l] large med-pack
[m] large med-pack
[n] phase device
[o] phase device
[p] homing phase device
[q] homing phase device
[r] homing phase device
[s] envirosuit pack
[t] thermonuclear bomb
[u] agility mod pack
[v] Hellwave Pack
-- Resistances -----------------------------------------------
Fire - internal 0% torso 25% feet 0%
-- Kills -----------------------------------------------------
124 former humans
80 former sergeants
65 former captains
147 imps
44 demons
69 lost souls
51 cacodemons
18 hell knights
27 barons of hell
43 arachnotrons
19 former commandos
10 pain elementals
25 revenants
9 mancubi
21 arch-viles
1 nightmare demon
1 Cyberdemon
1 Spider Mastermind
-- History ---------------------------------------------------
He started his journey on the surface of Phobos.
On level 5 he stormed the Chained Court.
On level 5 he assembled a high power weapon!
On level 6 he assembled a tactical boots!
On level 8 he encountered the Phobos Anomaly.
On level 9 he entered Hell's Armory.
On level 9 he assembled a nanofiber armor!
He left the Armory without drawing too much attention.
On level 12 he found the City of Skulls.
He fled the City in terror!
On level 16 he found the Tower of Babel!
On level 17 he found the Hellwave Pack!
On level 23 he stumbled into a complex full of arch-viles!
Then at last he found Dis!
On level 24 he finally defeated the Mastermind.
-- Messages --------------------------------------------------
Fire -- Choose target...
You see : a Spider Mastermind (almost dead) | pool of blood | [ m ]ore
The missile hits the Spider Mastermind. The Spider Mastermind flinched!
Fire -- Choose target...
You see : a Spider Mastermind (almost dead) | pool of blood | [ m ]ore
The missile hits the Spider Mastermind. The Spider Mastermind flinched!
Your weapon is empty.
You reload the high power pistol.
Fire -- Choose target...
You see : Ilya Bely (unhurt) | floor | [ m ]ore
Find a more constructive way to commit suicide. Targeting canceled.
You are hit!
Fire -- Choose target...
You see : a Spider Mastermind (almost dead) | blood | [ m ]ore
The missile hits the Spider Mastermind. The Spider Mastermind dies.
Congratulations! You defeated the Spider Mastermind! Press <Enter>...
-- General ---------------------------------------------------
743 brave souls have ventured into Phobos:
687 of those were killed.
1 of those was killed by something unknown.
10 didn't read the thermonuclear bomb manual.
And 26 couldn't handle the stress and committed a stupid suicide.
19 souls destroyed the Mastermind...
3 sacrificed itself for the good of mankind.
13 killed the bitch and survived.
3 showed that it can outsmart Hell itself.
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This was a very lucky game - I had a good supply of medpacks, great level layouts, lots of timely berzerks and maps and a power/bulk mod combo in the Chained Court gave me a high power pistol which I relied on heavily. This is the first AoMr game I've managed that actually spawned a pistol I could use: blaster. It helped a ton with the Revenants.
The other extremely lucky bit was an invulnerability globe just before the anomaly which helped me get through it in one piece. That more than anything else probably made the run.
Worst moment was the first door I opened in Deimos. I had to get up and walk around a bit to catch my breath and when I got back I got greeted with a rocket to the face from a Mancubus. I lost a very promising run recently in almost exactly the same way but for once I managed to do the right and the knock back from the pistol saved me. From there on the run was comfortable.
For me my biggest problem is playing too fast and screwing things up so I took a leaf out of Tormuse's book and took a lot of short breaks to clear my head when I needed it.
Overall I'm super chuffed.