Don't tear yourself apart trying to find this one.
Variant discussion activate!
Unlocked her fighting La Capitan on Mars Base with Unity, Dark Visionary, Tempest, and Argent Adept.
Card unlocked after defeating La Capitan, killing blow by Tempest using Vicious Cyclone. Unity (and I think everyone except possibly Argent Adept) was under 10 HP.
Edit:
Some additional details ... previous game had also included Unity (Iron Legacy vs Unity, Argent Adept, Scholar, Absolute Zero in Silver Gulch), with the heroes soundly defeated. During the game with La Capitan, a number of bots were in play at the end (Stealth, Speed, Raptor, two Platform, Champion, Cryo)
jrboegman's method has been refined slightly. I tested it using the same team composition against the same villain/environment.
Final HP values were Unity 12, Dark Visionary 13, Tempest 14, Argent Adept 13. Did not unlock.
Tried to mix it up a little -- same team plus Fanatic, same villain, different environment (Insulation primalis).
No unlock. 3 of the 5 Freedom-bots were in play, tempest got the last hit.
Did the same thing–first losing to Iron Legacy with characters and environment listed, then defeating La Capitan with characters and environment listed. Only had Cryo and Stealth of the F5 bots put, though. Killing blow by AA with scherzo.
Did not unlock.
La capitan in the block with Legacy, unity,super scientific tachyon, tempest, redeemer fanatic. All under 10 hp, killed using vicious cyclone. No Unlock
I'm pretty sure you can't have Fixer on your team for this one.
A friend of mine posted on the steam fourms that he unlocked her.
I met up with him online today and asked him what he did to unlock.
He had 8 or 9 bots out including all but one of the freedom team, he had lower then 10 hp.
There is a screen shot of it on the steam forum unlock page for Unity.
Based on some testing -- and several unlocks -- on the Steam thread, we seem to have gotten the general rule "play a bunch of bots, have them deal a bunch of damage, Unity finishes with single-digit HP."
Also, having had Unity -- and possibly other Freedom 5 characters -- previously defeated by Iron Legacy is seemingly a requirement.
There's something we're missing, though, because I did all of that and didn't get the unlock; an interesting theory one poster proposed was that you needed to have another Freedom Five member (probably one who isn't Legacy on the team), play the bot corresponding to that character, and have that bot do its thing (e.g. Stealth Bot redirect, Turret/Cryo inflict damage, etc.) at least once. Didn't seem to work for me, though. I begin to suspect there's another prior game requirement -- like having Baron Blade incap Young Legacy, an idea a lot of people have thrown around.
Had 10 bots in a fight, and all of the Freedom 5 bots were there. Even had Unity at 5 hp. No unlock.
To be fair it was against Blade, so...
Update.
A lot of people on the steam forums are getting her. Everyone is looking for concrete evidence on how to get her.
After reading all the comments and trying each strategy here's what happy to say I found out.
-HP must be below 10 for Unity.
-Must use each freedom bots function at least once.
-Must meet a certain amount of bots in play.
-A bot nor Unity does NOT have to deal the final blow.
-HP does NOT have to be below 10 for all heroes.
-Must lose previously to iron legacy with the freedom five. (-legacy)
-Villian does NOT matter.
-Environment does NOT matter.
(All the above is based on unlockers words with screen shots as proof)
After playing 24 matches with various combos of the above and trying I am happy to say the search for concrete evidence is over.
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Well at least for me cause I give up.
-I had intentionally lost to iron legacy a match before with the freedom team.
-I had every golem out at the end except for one bee bot.
-I had done over 70 damage with golems.
-I had each freedom bot use its function.
-All HP was below 10 for everything on the map.
-Raptor bot did the final damage.
(Setup was: Absolute Zero, Omnitron-X, Unity. Time Cataclysm. Baron Blade)
Good luck! The variant search is over for me after 24 games with Unity trying to figure this out and 13 with Bunker trying to figure his out. I'm done tearing myself apart. It's up to you now.
This is a bit of a double post from the Bunker discussion:
Just got both Golem Unity and Engine of War Bunker in the same game. Team was:
Argent Adept, (normal) Bunker, Omnitron-X, Unity vs. Baron Blade in the Block
Based on some stuff from the Steam forums, I thought that Bunker dying in the Block (where Fright Train is seen) was a good idea. I thought that Prison Riot might be a necessary component, but I never saw it, so I guess it isn't.
I basically used AA and O-X to give Unity tons of card plays while Bunker used Grenade Launcher on various targets and stacked up the Omni-Cannon. Once Unity had a fleet of bots, I had Bunker Omni-Cannon himself and then I let Unity's bots start hitting herself to get her down to 6. Raptor bot won the game with a hit for 12 against the Baron.
I started using O-X on The Block to try for Prison Riot, but never saw it (or apparently needed it).
Prior to this game (based on advice from both forums) I lost 2 games against Iron Legacy using various Freedom Six team comps.
Specific to Unity, I had Champion Bot, Turret Bot, Stealth Bot, Swift Bot, AND Cryo Bot out, and all of them had done "their thing" at least once. I also had all 3 Platform Bots out, as well as one Raptor Bot, and maybe 1 Bee.
I just unlocked her. I lost a game beforehand to Iron Legacy with Unity and 4 other Freedom Six characters on my team. Then, I beat Ambuscade in Megalopolis with Unity, Tachyon, Tempest, DV, and AA. Unity had 10 bots out and was at 8 HP. Most of the other characters were above 10 HP. I had every Freedom Five bot out, but most of them hadn't used their ability during the game. A bot delivered the final punch.
I think it's just lose a game to Iron Legacy with Unity, then beat a villain with Unity at 9 HP or lower and 10 or more bots out, maybe including all the Freedom Five bots.
Did bunker unlock when he incapped or when you won?
Unlocked Unity with eight bots out: Champion, Swift, Cryo, Turret, Raptor, Bee, & 2 Platform. Stealth had been out earlier. All the bots' special abilities got used at least once. I played Powered Shock Wave that turn, but Raptor made the killing blow. Made heavy use of Construction Pylon during the game, and I think I used Modular Workstation and Inspired Repair at least once each.
I'd previously played a game with the Freedom Five (minus Legacy) + Unity vs. Iron Legacy & lost, though I did have him down to 5 hp. Also had a previous successful game against Iron Legacy in which Unity went down to 0hp.
This game was in Insula Primus vs. Cosmic Omitron with Unity, Scholar, Argent Adept, Visionary, and Tempest. Everybody ended at less than 10 hp.
Got it. First attempt was I had 10 bots, all Freedom 5 in play, no unlock. Tried losing to Iron Legacy, then went back and did it again, this time 12 bots, not all F5 were in, but each were in play at least once. It was on the Block with Baron Blade.
My working hypothesis is:
"Unity gets incapacitated by Iron Legacy. Then win a game while Unity is at 10 or fewer HP and Mr. Fixer is not on your team. Champion Bot, Cryo Bot, Stealth Bot, Swift Bot, and Turret Bot must have all entered play during this game."
I have the unlock, so I can't test further.
I just unlocked her! She got incapped by Iron Legacy, then we did Bunker, OmniX, AA, and Unity at The Block; she had 5HP and at one point all the bots made an appearance. I tried it before with this setup and it didn't work, this time I used Powered Shockwave to finish it. I didn't play that card the time it didn't work, so I wonder if you have to play Powered Shockwave at least once.
Then again, I had OmniX and Argent Adept giving Unity so many card plays and draws, it was sick. I think she played everything. She used 3 construction pylons, she activated Volatile Parts, she brainstormed twice, she did NOT play modular workbench, she did NOT play scrap metal, she did play Flash forge and Supply Crate, she did NOT play Robot Relcation or Hasty Augmentation.
My theory: Have Unity get incapped by Iron Legacy, then use Powered Shock wave. Unity must either have played 5/8/10 bots or have done 20/30/50 damage between her and her bots.
Hope this helps!
It's not this exactly, as I just fulfilled these exact conditions and didn't get the unlock.
This is interesting; in the game above where I failed the unlock, I didn't play Powered Shockwave. I'll try it again later with shockwave and see if that works.
I attempted the dual unlock for Bunker and Unity. Got Unity, did not get Bunker.
Had Omni, AA, Bunker, Unity and Dark Vis(in that order) fighting Baron Blade in the Block. Using Omni+AA+Dark Viz shenanigans I got out a mess of Unity's bots and had out all FV Bots(for at least one round so they could each do their thing) along with 3 raptors, a Bee-bot(which died) and a Platform Bot. Bunker played Upgrade Mode(which left play) along with Omni-Cannon and Flac Gun and had it charged up to 9 cards. I tried to perform a self-kill with him but had one point left, so Turret Bot finished him off. With a Raptor bot Biting unity down to 7 hp, Unity's bots won the game.
Edit: I had both lose a game against Iron Legacy a few games prior.