Ak02
I think even if Charles kills the Red Prince, he will be reborn in the infernal plane. To be considered a prince on the infernal plane, he either has a lot of power or had (before he was reborn on the Edhen/Eden plane), or he must be the descendant of a great demon at the deity level and therefore receive prince status. Anyway, seeing how many beings from the infernal plane reincarnated in the Edhen Plane, we can assume that it is a planned attack targeting the Edhen Plane itself by a faction of the infernal plane. Charles is sure to provoke the other party by eliminating the red prince, if he actually kills him.
Btw, when we say plan is it really a plan? Don't we have normal planetary shapes in this parallel universe or are they just ''disks'' or ''continents'' instead of spherical shapes? They never explain much about the form of the plans when they mention them in the novels. And I always think about gravity and its effect and logic in a flat form and a thousand other things (I like to write too, but I'll never post, I kind of do it for myself and so I think about these things, I usually make an excuse about mana or magical forces and how they would influence the gravitational force). Anyway... is it like the ''flat earth theory''?