(￣︶￣) The Warmaster's Gift
That day, no one knew what exactly Allie had said to Horus.
In any case, perhaps her psychic power had successfully caught Horus's interest. Perhaps her status as a resistance leader had played a part. Or perhaps it was for some other reason—for example, Horus really did need to unite every force he could and bring them into his great cause of resisting the Imperium of Man and the False Emperor?
In short!
After Horus accepted her offer and agreed to let her and her resistance forces join him, one of her backup plans might actually have succeeded.
From that day on, she began officially walking the line between Warmaster Horus, who represented Chaos and rebellion, and Loken, a prominent loyalist busy dealing with and suppressing the Warrior lodges and the spread of certain unsavory ideas. She directly took on the role of a double agent.
At Horus's request, what she had to do was actually simple: monitor Loken before the fleet reached the Isstvan System and, if possible, earn more of Loken and the other loyalists' trust, learning as much as she could about their every move so she could assist Horus with one of his nefarious plans.
In return, Horus would provide Allie and her resistance with equipment, operational support, and other conveniences. He even supplied them with weapons and gear, allowing her to form a new Imperial Army auxiliary battalion made up of more than a thousand ordinary people.
As for what sort of people made up that newly formed battalion, that was a matter of perspective.
There was also this: if everything went smoothly, Horus promised that he would give her and her resistance a desolate planet in the Isstvan System. Allie, as the resistance leader, would serve as its Planetary Governor