From what I read and people who realllly love Gears pieced together (dev documents, game collectibles etc) it went something like this:
The Locust live underground and humans are oblivious to that.
Locust live close to the immulsion which is still not quite as evolved so their DNA gets somewhat mixed with it but they don't mutate just yet.
Humans discover immulsion and create a process to turn it into fuel.
People start getting rust lung from working near the immulsion which is like an early stage of going lambent.
At the same time that the government starts trying to find a cure for this, in order to keep using immulsion as fuel, they stumble upon a "rock creature" which is a locust.
The locust have been living near the immulsion for years so they have developed a sort of immunity to it.
The government starts experimenting and combining locust DNA with the sick miners to try and create a cure for immulsion poisoning. They also start experimenting on the children of those miners which seem to exhibit stronger immunity.
According to documents there is one child that is a perfect match of Locust and Human genes and is completely immune to the immulsion and she is called Ruth.
The "Sires" which are basically the miners and their offspring which the scientists experimented on are moved up into the mountains where somehow Ruth rejoins the locust.
Lambent locust, not completely mutated are waging a civil war with the regular Locust. Ruth who we assume is the Queen has a natural disdain for humans at this point from all the experiments and testing done on her and the locust when she was a child.
She could ask the humans for help in fighting the lambent but because of past experiences she decides to just attack them instead thinking that a peaceful treaty would never work anyway, deeming humans to be cruel etc. They attack human cities because the lambent are spreading too quickly and pushing them up from the underground passages.
It is suggested that Adam Fenix met Ruth when he was working at that one place where the Sires experiments took place and that is how he knew about the Locust and e-day.
He begins working for the Queen trying to find a way to cure lambency without killing the Locust.
Dropping the first lightmass bomb into the locust tunnels accelerates the growth of the immulsion parasite and thats how you get those crazy mutant lambent and human lambent.
Anyway thats what I read - and thats supposedly why Myrrah looks human and why she wasn't killed by the Lambent killing machine from the end-game. The story also fits well with all her quotes
"The Humans of Sera built a glorious civilization, but Humans are not destined to create. They ultimately did what they do best. Destroy. But this was nothing, compared to a new threat, from below. An enemy that will force Humanity to take their last, inevitable steps, toward extinction."
"We could have cooperated with the ground walkers for our mutual salvation, but they are humans, and they only understand dominance and ownership. All that we have left is a war to the death. For all their so-called intelligence, humans are blind to the threat right before their eyes. We never stood a chance of enlisting their aid, so now we fight alone. And we will stand on their corpses to do so."
"You humans! Why do you think your lives are worth more than ours? Don't you realize who we are? Don't you recognise all your most admirable qualities in us? Oh yes... we are genocidal monsters! Just like you!"
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