Legion20
I'm just getting into these type of stories so not sure if its unique to this story or common among the genre but the level of detail the author puts into the the MC learning the magic. Those steps could be extremely common from some very popular game or story in this genre but if it's something he came up with and kept its consistency shows the great talent of this author. if he is truly a rookie and this an original piece of his I'd read more of his work for sure
I do think that Lith and Solid are being pretty dumb/naive. Despite Liths paranoia basically being his super power. He seems to care more for "making sure" and having proof. I guess it's character development that he doesn't just raid the suspicious trinkets and make up an excuse afterwords? The engagement gift should give off massive alarm bells.