I was kinda hoping this manga would change, but it did not.
First, the ENTIRE premise doesn't make any sense. If him inheriting the throne would mean a civil war, as was explained in chapter two or so, there were ZERO reasons for the king to let him live till this age. He would have not inherited anyway, so who cares.He would have just created problems anyway, so just kill him and his mother and pretend he was a stillborn and the mother died of childbirth. There's no merit whatsoever to keep him alive until you have another son. Might as well kill him immediately and pretend you never had that son you are so ashamed of.
Of course, the entire: "you're a support magician/ alchemist so everyone hates you and wants to kill you" premise is equally retarded. It makes no sense, and just creates pointless drama. Moreover, the author drove himself into a corner now. Either the elf kills his mother, tries to kill him, and he escapes. And then we have a revenge manga where the MC goes around murdering and pillaging and raping the entire planet.
Or, the elf decides to spare him and he starts traveling with her. In which case, everything we were told up to now was pointless bullshit, since him being able to travel would mean that " you're a support magician/ alchemist so everyone hates you and wants to kill you" was bullshit from the very beginning.
In the end, the "plot" is just a turd at this point, and it's entirely the author's fault.