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Just won for the first time, after hundreds upon hundreds of marines died in attempt after attempt (Now to try a different class).

Thoughts at end (in case someone wants to avoid spoilers)

Miao, level 14 Marine, defeated
The Summoner against all odds.
He survived for 12515 turns.
The run time was 1h 59m 43s.
He scored 5387 points.
He liked it HARD!

CALLISTO L2 -> Callisto Mines L1
Callisto Mines L3 -> Callisto Anomaly
Callisto Anomaly - cleared
EUROPA L2 -> Conamara Chaos Biolabs L1
Conamara Chaos Biolabs L2 -> Containment Area
Containment Area - cleared
IO L2 -> Io Black Site L1
Io Black Site L2 -> Black Site Vaults
Black Site Vaults - cleared
BEYOND L1 -> The Arena
The Arena - cleared

Medal of Prejudice (+200)
* Won with 100% kills
CRI Star (bronze cluster) (+25)
* 25+ kills without taking damage
Explorer Ribbon (+50)
* Visited all encountered special levels
Conqueror Ribbon (+100)
* Completed all encountered special levels
JoviSec Silver Badge
* Win a game
JoviSec Gold Badge
* Win a game on at least HARD
CRI Bronze Badge
* Win any game with 100% kills
CRI Silver Badge
* Win a MEDIUM or higher game with 100% kills

He killed 435 out of 435 enemies.

1 former CRI heavy
11 former commandos
3 former CRI soldiers
3 exalted ravagers
40 fiends
2 corrupted sergeants
9 former soldiers
1 summoner
1 cyberos
14 siege ravagers
6 combat drones
5 former sergeants
4 corrupted soldiers
4 CRI marines
17 cryoreavers
2 corrupted heavys
7 cryobeross
1 former CRI sergeant
15 security drones
12 exalted reavers
6 plasma ravagers
3 exalted fiends
5 kerbeross
26 armored ravagers
10 security bots
38 turrets
41 archreavers
7 CRI bots
5 corrupted commandos
10 reavers
1 former CRI grunt
2 military drones
47 fire fiends
6 exalted soldiers
12 former guards
10 former grunts
23 ravagers
2 hellish soldiers
2 former heavys
15 rocket turrets
6 toxic reavers
2 toxibeross
2 former CRI guards

Ironman L2
Hellrunner L2
Reloader L2
Son of a Bitch L2
Focused fire
Whizkid L2
Reload Dance

Slot #1 : ADV chaingun P
Slot #2 : CRI plasma shotgun A3
Slot #3 : rocket launcher B3
Body : red armor PBA
Utility : ADV rifle critical amp

energy cell (x45)
rocket (x4)
7.62 ammo (x100)
7.62 ammo (x100)
7.62 ammo (x22)
repair kit (x1)
stimpack (x3)
small medkit (x2)
large medkit


*Red Armor PBA + 5 dropped repair kits over the course of the run was key (one of which I accidentally used early, instead of a medpack). B-mod stretched it's usable lifespan, and A-mod let me use my ammo more efficiently (I was down to 60ish 7.62 and ran out of rockets at one point.)

*Trading my Chaingun P3 for the Adv Chaingun (which had 20% critical and 50% critical damage) was a good move, since it let me occasionally 1-shot ravagers.

*Rocket Launcher B3 and 1.5 stacks of rockets made the summoner pretty easy.

*Reload Dance is a trait taken once one has reached Io, not before. If taken before, one can't use the residual ammo in dropped weapons to save ammo (which is occasionally needed to preserve ammo if the RNG spanws the wrong set of humans and ammo chest rolls don't work out). OTOH, if you're fighting against four ravagers at the same time (I can make some pretty poor tactical choices), not having to take the time to reload the chaingun or rocket launcher is the difference between life and death.
Congratulations, especially that it's HARD! Good too see that ADV weapons are finally worthwhile.