Oh it's not impossible, and he may very well have been sheltered... the odds are just somewhat against living for thirty years in a northern country and never having learned anything about the deo'iel or demonspawn. Even in remote villages that has never seen either, and probably won't within a lifetime, both are pretty well-known thing, even among children. Deo'iel are pretty much what most adventurous children dream of being and call themselves as they play heroes (even if deo'iel are rarely that straightforward), and demonspawn are the bogeymen of the Prophecy-universe, the kind of thing parents like to scare their children into compliance with tales of. And in a major city like Seclyr, not hearing about them would be even harder; possible, but unlikely. I'm not contesting that it could be the case, I'm only explaining why I was initially so in doubt about whether that could really be true.
(If there was a Rodorian city to live in without having anything to do with deo'iel, however, it would be Seclyr City. The deo'iel almost never go there, partly because many deo'iel are mages and thus would be prosecuted (and likely executed) in that duchy, and partly because deo'iel are less needed there (Seclyrian warriors are liable to hunt monsters themselves rather than ask for outside help)... which is less of a factor in and by itself, but becomes much more relevant in that it means that Seclyr doesn't never donates any resources to the Order. As altruistic as many think the deo'iel for hunting dangerous monsters without asking for any recompense, they do tend to focus their efforts protecting those that help sustain them.)
