[@Drakey]Nicely done! I like the idea that Rodion's inventions were what caused Stina to almost die. Adds a cool wrinkle into their relationship. :p

 As for the research into fire, I'm going to allow it but, it has to be a kind of pipe dream for Rodion, a sort of impossible vanity project that he himself knows to have very little chances in actually succeeding. It'd also have to be kept a close secret, and he wouldn't be able to tell anyone about it, as the concept of fire itself is openly heretical to the Church (remember, it is the element of the Great Enemy who sundered their god). Maybe he studies it as a silent "fuck you" to the church?

 When it comes to demonic ether fueling his creations, sure, this can be a thing, but as I mentioned before, this practice has had very little research and experimentation done on it for it to go off without a hitch. He'd have to spend some time working with it first, and it wouldn't be a success the first time he attempts it.