While there is discussion to not have the medal Zen Master's Cross, I decided to try to go for it anyway. The medal requires that all kills are in the "other" category, as opposed to "fists", "knives", "pistols", or "shotgun". Other kills only seemingly count in-fighting, nukes, enemies dying in fluids, and other means of kills that are not directly from your weapon. One of the nice new features is that if for example, you are holding a Shotgun and a Demon dies in acid, it doesn't count as a "shotgun" kill but an "other" kill. Note that weapons of different categories such as Chainsaw, Rocket Launcher, etc will still count towards your kills in a general sense. The stipulation for this medal is that "Other" kills matches your total kills.
I figured the easiest way to earn this is Angel of Overconfidence + Angel of Berserk, so that I start near the end of the game, and can grab the Nuclear BFG as a way to kill The Spider Mastermind since there aren't any other ways to kill it. After a few tries, I got it pretty fast.
I saved the Chainsaw boost until entering Mortuary.
And lucky me, there were no Archviles on the right side.
After that, I continued on my way to the Spider Mastermind, blew up Dis, and got this strange medal!
Here's the mortem:
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DoomRL (0.9.9.8 BETA 1) roguelike post-mortem character dump
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Icy, level 2 Demon 1st Lieutenant Scout,
sacrificed himself to kill the Mastermind at the City of Dis.
He survived 2697 turns and scored 12768 points.
He played for 2 minutes and 31 seconds.
He didn't like it too rough.
He killed 14 out of 208 hellspawn. (6%)
My, wasn't he a wimpy chump.
He was an Angel of Berserk!
He was also an Angel of Overconfidence!
-- Special levels --------------------------------------------
Levels generated : 4
Levels visited : 3
Levels completed : 0
-- Awards ----------------------------------------------------
Medal of Pacifism Won with 10% or less kills
Zen Master's Cross Won & killed everything w/o fists/weapons
Berserker Silver Badge Complete Angel of Berserk (AoB)
-- Graveyard -------------------------------------------------
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-- Statistics ------------------------------------------------
Health 0/50 Experience 952/2
ToHit Ranged +0 ToHit Melee +0 ToDmg Ranged +0 ToDmg Melee +0
-- Traits ----------------------------------------------------
Class : Scout
Intuition (Level 2)
Int->Int->
-- Equipment -------------------------------------------------
[a] [ Armor ] red armor [4/4] (96%)
[b] [ Weapon ] nothing
[c] [ Boots ] nothing
[d] [ Prepared ] nothing
-- Inventory -------------------------------------------------
[a] red armor [4/4] (100%)
[b] red armor [4/4] (100%)
[c] combat knife (2d5)
[d] chainsaw (4d6)
[e] small med-pack
[f] large med-pack
[g] large med-pack
[h] large med-pack
[i] large med-pack
[j] envirosuit pack
[k] bulk mod pack
-- Resistances -----------------------------------------------
fire - internal 0% torso 25% feet 0%
-- Kills -----------------------------------------------------
1 former sergeant
1 former captain
1 imp
10 demons
1 Spider Mastermind
-- History ---------------------------------------------------
On level 1 he invaded the Unholy Cathedral!
He fled the Unholy Cathedral seeing no chance to win.
On level 4 he was foolish enough to enter the Mortuary!
He managed to escape from the Mortuary!
On level 6 he entered the Lava Pits.
He decided it was too hot there.
Level 7 was a hard nut to crack!
Then at last he found Dis!
He overloaded a nuclear BFG 9000 on level 8!
On level 8 he finally sacrificed himself to kill the Mastermind.
-- Messages --------------------------------------------------
You enter the damned city of Dis...
You wear/wield : a nuclear BFG 9000 (8d6) [40/40]
Are you sure you want to overcharge the nuclear BFG 9000? This will overload
the nuclear reactor... [Y/n]
You overcharge the nuclear BFG 9000! Warning! Explosion in 10 seconds!
Warning! Explosion in 9 seconds! Warning! Explosion in 8 seconds!
Run - direction...
Warning! Explosion in 7 seconds!
Warning! Explosion in 6 seconds!
Warning! Explosion in 5 seconds!
Warning! Explosion in 4 seconds!
Warning! Explosion in 3 seconds!
Warning! Explosion in 2 seconds!
Warning! Explosion in 1 seconds!
Congratulations! You defeated the Spider Mastermind! Press <Enter>...
You feel relatively safe now.
-- General ---------------------------------------------------
23 brave souls have ventured into Phobos:
10 of those were killed.
2 didn't read the thermonuclear bomb manual.
And 2 couldn't handle the stress and committed a stupid suicide.
9 souls destroyed the Mastermind...
5 sacrificed itself for the good of mankind.
4 killed the bitch and survived.
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As amusing as this was, I still think this medal should be swapped for a different idea.