[Threshold] Just finished Threshold, I need more stories

I read Threshold and immediately need the following two stories:

1. The greatest Career Counselor to ever live has always fancied himself a free spirit, hopping from Iteration to Iteration as he plies his services, confident that nobody would harm him- after all, who would kill the goose that lays the golden eggs? But when an assassin almost claims his life, desperation drives him to seek the aid of the Abidan in the midst of their recruitment drive. Can he help one headhunter while staying ahead of his own?
2. Emriss, Dross, Orthos, and Ziel must raise their new, assimilation-happy acquaintance and teach them that it's frowned upon in society to subordinate other's personalities within your own. (Written in the style of Jane Austen)

---
More seriously, I still have questions about Harness, and what was up with the walls. First I was like "Oh wait, Ziel just doesn't know what Mains Electrical is", but then Psychic Rayquaza used it to more-or-less reach Monarch. Is there an Attack on Titan reference here? Given how it seems like even the rocks are monsters, I wonder if inorganic material is basically monster parts (which raises questions about the planet itself). It seems like aside from Amalgam, iterations have a single cohesive power system, so whatever is up with the walls has to be related to the monsters- any thoughts?