Back to the Holy Mountain Range, which has now turned into Jacob's backyard. Because of Sylas's secret interference, the Faery Humans would not seek to reclaim this place or seek revenge. If anything, Sylas was saving them from certain death!
Nonetheless, now that the Treaty has signed a deal with Jacob, saving a few more Faery Humans won't matter anymore because, according to their deal with Jacob, they won't interfere with the locust army and will also encourage the factions of unique plains to take part in this war.
Although the Queen Ice Fiend Locust's target was Jacob, those three factions didn't know that, and so the more they tried to resist the army, the more bloody mess it caused, which was Jacob's goal to begin with.